Do Bronze Corydoras Show Affection? (7 Signs Explained)

Bronze Corydoras are small, peaceful fish that often inhabit community aquariums. Their playful nature and gentle movements make them a favorite among hobbyists seeking a calm, interactive addition to their tanks. Observing them can be quite rewarding.

Bronze Corydoras display affection through specific behaviors such as swimming close to companions, gentle nudges, synchronized movements, resting near tank mates, responding to human presence, showing comfort in groups, and engaging in playful interactions that demonstrate trust and social bonding.

Recognizing these behaviors helps aquarists better understand their fish and create a more enriching and harmonious tank environment for long-term well-being.

Swimming Close Together

Bronze Corydoras often swim in tight groups, gliding side by side across the tank. This behavior is a sign of comfort and trust within their group. Observing them moving in unison can be quite calming, and it highlights their social instincts. When these fish stay close to each other, it shows they feel safe and secure in their environment. Swimming together also helps reduce stress, especially in tanks with multiple species. Even when exploring the tank, they tend to remain within a small distance from their companions. This close swimming is more than just following instinct; it is a way of expressing connection. Watching them interact in this way can make the aquarium feel more alive. These moments demonstrate the subtle but clear ways Bronze Corydoras show affection, providing insight into their natural behaviors. Paying attention to these patterns allows for better care and a deeper understanding of their social needs.

Close swimming indicates strong bonds and a secure environment for Bronze Corydoras, reflecting their trust in each other and in the tank conditions.

Recognizing this behavior helps in tank management. Keeping groups together ensures they remain healthy and active. Observing their swimming patterns can reveal stress levels, comfort zones, and even compatibility with other species. It also informs feeding routines, as synchronized movements often lead to shared feeding spots. Adjusting tank size, décor, and hiding spots can enhance their comfort, encouraging natural social behaviors. By creating an environment where Bronze Corydoras can swim closely and interact freely, aquarists support both mental and physical well-being, making the tank a dynamic and engaging space for observation.

Gentle Nudges

Gentle nudging is common among Bronze Corydoras, signaling attention or connection between fish.

These nudges are soft touches with their snouts against another fish or occasionally a hand in the tank. It is their way of exploring and showing acknowledgment without aggression. Nudging can indicate curiosity, comfort, or even reassurance within their group. When a fish repeatedly nudges another, it demonstrates a level of trust and engagement.

Paying attention to these interactions can improve how you care for them. Adjusting tank companions and spacing ensures each fish feels safe and acknowledged. Over time, these subtle gestures reveal patterns of affection and social structure. Aquarists who notice these small touches gain insight into individual personalities and how they relate to one another. Providing consistent water conditions and gentle interaction encourages this behavior, creating a harmonious environment. Bronze Corydoras rely on these tactile cues to communicate and maintain bonds, making nudging a simple but meaningful way they show care and connection.

Resting Near Tank Mates

Bronze Corydoras often rest close to each other, sometimes touching or overlapping slightly. This behavior signals comfort and trust within their group. Resting together reduces stress and strengthens social bonds, showing they feel secure in their environment.

Resting near tank mates is not random. These fish select companions they trust, often returning to the same spots repeatedly. It is a way of maintaining connection and ensuring safety. In community tanks, this behavior helps them navigate potential threats and feel less isolated. Observing their preferred resting partners provides insight into their social preferences and interactions. When multiple Corydoras rest together, it indicates a calm, balanced tank environment, reflecting both security and healthy social dynamics among the fish.

This resting behavior also impacts tank management. Providing hiding spots, soft substrate, and gentle water flow encourages comfort and repeated rest patterns. Consistent observation can reveal which fish naturally bond, helping to maintain harmonious groups. Over time, this understanding allows better placement of new tank mates, ensures adequate space, and supports overall well-being. When Bronze Corydoras rest close together, it demonstrates their subtle yet clear way of showing affection and contentment within a shared habitat.

Responding to Human Presence

Bronze Corydoras may approach the glass or swim toward gentle hand movements, showing recognition and trust. This behavior reflects their comfort in a stable environment.

These fish respond gradually to humans, often watching movements before engaging. Approaching the glass or following a finger is not random; it indicates familiarity with feeding routines or gentle interaction. Over time, they may come closer during feeding, signaling trust and comfort. This responsiveness develops in tanks where water conditions are consistent, and interactions are calm. Noticing these small gestures provides a deeper understanding of each fish’s personality and comfort level.

Regular observation and interaction strengthen this connection. Feeding them consistently at similar times encourages predictable patterns. Gentle tapping or finger movements can elicit responses, reinforcing trust. Recognizing their individual behaviors allows tailored care, ensuring each fish feels secure. This behavior also informs tank setup, as proximity to humans often aligns with comfort zones. Maintaining clean water, proper temperature, and minimal stressors enhances responsiveness. These actions reveal the gentle ways Bronze Corydoras communicate affection and engage with their environment, demonstrating intelligence and social awareness.

Synchronized Movements

Bronze Corydoras often swim in coordinated patterns, matching speed and direction with their group. This synchronized movement shows comfort and connection, highlighting their natural social instincts within the tank.

These coordinated movements are not accidental. They help maintain group cohesion, reduce stress, and demonstrate mutual trust among tank mates.

Playful Interactions

Bronze Corydoras engage in playful behaviors such as chasing gently or exploring together. These interactions indicate mental stimulation and a sense of security. Watching them play highlights their social nature, and consistent play reflects a well-adjusted and healthy tank environment.

Showing Comfort in Groups

Being in larger groups allows Bronze Corydoras to feel safe. Their relaxed posture and active swimming reflect confidence and contentment in their shared environment.

FAQ

How can I tell if my Bronze Corydoras are showing affection?
Bronze Corydoras express affection through their behaviors rather than vocalizations. Close swimming, gentle nudges, synchronized movements, and resting near tank mates are all clear signs. They may also approach the glass or respond to gentle hand movements, showing trust and comfort in their environment.

Do Bronze Corydoras prefer certain companions?
Yes, they do. Corydoras are social fish and feel more secure with familiar companions. Over time, they tend to form small groups within the tank, often returning to the same companions for resting or swimming. Observing their preferred partners helps understand their social structure.

Can they recognize me as their caretaker?
While not in the same way pets like dogs might, Bronze Corydoras do recognize patterns and routines. They associate your presence with feeding and safety. Gradual, calm interactions can lead them to approach the glass or follow your movements, demonstrating a level of trust.

Is nudging always a sign of affection?
Not always. Gentle nudges usually indicate comfort or attention, but more forceful or repeated nudging could signal stress, competition for space, or interest in food. Observing the context and accompanying behaviors helps differentiate affectionate nudges from other motivations.

How important is group size for their social behavior?
Group size significantly affects comfort and affection behaviors. Corydoras thrive in groups of at least six, allowing them to swim closely, rest together, and engage in playful interactions. Smaller groups may show stress, isolation, or less natural social behavior.

Do they show affection toward other species?
Bronze Corydoras can display social behaviors toward non-Corydoras tank mates if the species is calm and non-aggressive. They may swim near other fish or rest close by, but their strongest bonds are typically with their own species, as this aligns with their natural instincts.

What role does tank setup play in their behavior?
Tank layout greatly impacts comfort and affectionate behaviors. Soft substrate, hiding spots, moderate water flow, and consistent water parameters encourage resting, close swimming, and playful interactions. An environment that feels safe allows them to express natural social behaviors without stress.

Can individual personalities affect how they show affection?
Yes. Some Corydoras are naturally more social or curious, showing affection more openly, while others are reserved, observing from a distance. Recognizing individual differences helps tailor care, ensuring each fish has opportunities for comfort and social interaction.

How do feeding routines influence their interactions?
Consistent feeding routines build trust and encourage interaction. Corydoras quickly learn when and where food will appear, often swimming toward companions or the caretaker. This predictability reinforces comfort, leading to more visible affectionate behaviors like nudging or synchronized swimming.

Do Bronze Corydoras bond for life?
They form strong bonds with group members, though “for life” depends on tank conditions and longevity. Maintaining stable groups, proper care, and minimal stress supports long-term social bonds, with fish often showing consistent patterns of swimming together, resting, and playful interactions throughout their lifespan.

How can I encourage affectionate behaviors?
Providing a stable, safe environment with enough companions, gentle interaction, hiding spots, and predictable feeding encourages social behaviors. Observing patterns and maintaining consistent water quality supports trust, allowing Bronze Corydoras to express natural behaviors like swimming together, nudging, and playful engagement.

Are there signs of stress that reduce affection?
Yes. Erratic swimming, hiding excessively, loss of appetite, or aggression indicate stress, which can reduce social and affectionate behaviors. Addressing water quality, tank size, and group composition helps restore comfort and allows Corydoras to resume natural interactions.

Can these behaviors be used to monitor health?
Absolutely. Changes in resting patterns, reduced swimming together, or decreased nudging can indicate health or environmental issues. Regular observation provides insight into both social comfort and overall well-being, helping identify problems early for corrective action.

Do all Corydoras species show affection in the same way?
Not exactly. While close swimming and social behaviors are common across species, the intensity and frequency of affectionate behaviors can vary. Bronze Corydoras are generally gentle and social, but observing each species’ natural tendencies ensures accurate understanding of their behavior patterns.

How long does it take for Corydoras to show affection?
It varies depending on tank setup, group size, and individual personalities. Some fish show signs within days of being comfortable, while others may take weeks to form bonds and demonstrate consistent affectionate behaviors like synchronized swimming or nudging.

Can affection behaviors be influenced by tank size?
Yes. A tank that is too small can cause stress and limit natural social interactions. Adequate space allows free movement, group cohesion, and comfort, which are essential for healthy affectionate behaviors to emerge naturally and consistently.

How do hiding spots affect their social behavior?
Hiding spots provide security, reducing stress and encouraging social interaction. Fish are more likely to swim closely or rest near companions when they know safe areas are available. Proper placement of shelters supports comfort and promotes natural bonding behaviors.

Do they show affection during breeding?
During breeding, Corydoras may display increased close contact and synchronized movements. Males and females engage in coordinated behaviors, and group dynamics can intensify. Affectionate behaviors are often more visible as fish interact more frequently and maintain proximity during spawning periods.

Can diet influence social interactions?
A balanced diet supports energy levels, health, and activity, which in turn enhances social behaviors. Well-fed Bronze Corydoras are more likely to swim together, play, and explore confidently, whereas nutritional deficiencies can lead to lethargy or reduced interaction with tank mates.

What environmental factors most affect affectionate behaviors?
Stable water temperature, proper pH, low stress levels, and suitable companions are key. Disruptions like aggressive tank mates, sudden changes in water parameters, or overcrowding reduce trust and comfort, making affectionate behaviors less frequent or absent entirely.

Are there signs that a Corydoras prefers one companion over another?
Yes. Fish may swim closer, rest together, or nudge preferred companions more frequently. Observing repeated patterns of interaction helps identify favored relationships within the group, reflecting social bonds and individual preferences that shape daily behavior.

Can affection behaviors change over time?
They can. As fish age, adjust to tank conditions, or experience changes in group composition, behaviors may shift. Increased comfort can enhance social interactions, while stress or health issues may reduce affectionate displays. Monitoring over time ensures their needs continue to be met effectively.

Is human interaction necessary for them to show affection?
No. While they may respond to gentle presence, affection is primarily expressed toward companions and in response to a safe, stable environment. Human interaction can enhance recognition and trust, but natural social bonds within the tank are the main indicators of affection.

Do environmental enrichments promote affectionate behaviors?
Yes. Adding plants, hiding spots, and varied substrate encourages exploration, group cohesion, and playful interactions. A stimulating environment supports natural social instincts, making Bronze Corydoras more likely to display behaviors such as nudging, synchronized swimming, and resting near companions.

Can affection behaviors help in tank monitoring?
Observing social behaviors provides insight into tank health. Reduced swimming together, lack of interaction, or avoidance of companions can signal stress, illness, or environmental issues, allowing timely intervention to maintain both well-being and social harmony.

Are affectionate behaviors more common in younger or older Corydoras?
Affectionate behaviors are present throughout life but may be more noticeable in younger, active fish. Older fish may rest more and interact less energetically, though they still demonstrate bonds through close swimming, nudging, and proximity during resting periods.

How do water parameters affect social behavior?
Stable water temperature, pH, and cleanliness directly influence comfort. Unstable or poor conditions increase stress, reduce interaction, and limit affectionate behaviors. Maintaining consistent parameters allows Bronze Corydoras to express natural social tendencies reliably and maintain strong bonds.

Can these behaviors indicate hierarchy in the tank?
Yes. While Corydoras are generally peaceful, subtle cues like leading swimming groups, selecting resting spots, or initiating playful interactions can indicate social structure. Recognizing these patterns helps in understanding group dynamics and ensuring a balanced, stress-free environment.

How much observation is needed to understand their behavior?
Regular, consistent observation over several weeks provides the best insight. Watching interactions, resting patterns, nudging, and swimming behaviors helps identify bonds, preferences, and comfort levels, allowing better care and a deeper understanding of their affectionate tendencies.

Do tank decorations influence affectionate behaviors?
Yes. Plants, caves, and hiding spots create secure areas for resting and social interaction. Proper placement encourages swimming together, playful engagement, and nudging behaviors, enhancing the natural expression of affection and supporting comfort within the group.

Can affection behaviors coexist with feeding competition?
Yes. Even during feeding, bonded Corydoras may remain close and exhibit gentle nudges rather than aggression. Ensuring sufficient food and space minimizes competition while allowing natural social behaviors to continue alongside feeding routines.

Are these behaviors consistent across all times of day?
Mostly, but activity levels can vary. Corydoras are generally more active during feeding or exploration periods, showing synchronized swimming and playful interactions, while resting periods highlight proximity and bonding. Understanding daily patterns helps interpret affectionate behaviors accurately.

How do tank mates affect affectionate behavior?
Calm, non-aggressive tank mates encourage Corydoras to swim, play, and rest comfortably. Aggressive or territorial species may reduce social interaction, increase hiding, and limit affectionate behaviors, highlighting the importance of compatible tank companions.

Can affection behaviors signal readiness for breeding?
Yes. Increased proximity, synchronized swimming, and gentle nudging are often more frequent during pre-spawning periods. Recognizing these patterns helps anticipate breeding activity and provides insight into their natural reproductive behaviors.

Do stressors reduce affection?
Yes. Poor water quality, overcrowding, or aggressive tank mates increase stress, leading to isolation, erratic swimming, and reduced nudging or synchronized behaviors. Maintaining a stable, comfortable environment is essential for normal social expression.

Are playful interactions a reliable sign of health?
Generally, yes. Active play, chasing, and exploration indicate energy, curiosity, and well-being. Lack of these behaviors may point to illness, stress, or inadequate tank conditions, signaling the need for closer observation and potential intervention.

Can affection behaviors indicate long-term comfort?
Yes. Repeated close swimming, nudging, and resting patterns reflect consistent comfort and trust. Monitoring these behaviors over time provides insight into the tank environment’s suitability and the group’s ongoing social health.

Do Bronze Corydoras communicate affection differently in large vs. small tanks?
In larger tanks, behaviors like synchronized swimming and resting together may be more spread out, while smaller tanks encourage closer proximity. Regardless of size, comfort, security, and companion presence remain key to expressing affection naturally.

Are there seasonal changes in behavior?
Mild shifts can occur with changes in light, temperature, or feeding schedules. These may affect activity levels and visibility of affectionate behaviors but do not fundamentally alter their social tendencies if the environment remains stable.

Can affection behaviors be enhanced through enrichment?
Yes. Providing varied substrate, plants, hiding spots, and interactive feeding opportunities encourages exploration, coordinated swimming, and playful nudging. Enrichment supports both mental stimulation and social bonding, making affectionate behaviors more frequent and visible.

Is it normal for some Corydoras to be less affectionate?
Yes. Individual personality, age, and past experiences influence behavior. Reserved fish may observe from a distance rather than actively nudging or swimming closely, but they still participate in group cohesion and bonding in subtle ways.

Do affectionate behaviors change when new fish are added?
Yes. Introducing new tank mates can temporarily disrupt group dynamics. Corydoras may become cautious or hide, reducing social interaction. Over time, as trust is rebuilt and space is respected, affectionate behaviors generally resume, reflecting adaptation and comfort.

Can affection behaviors indicate happiness in the tank?
Yes. Active, social, and interactive behaviors like close swimming, nudging, and playful engagement signal contentment. A lack of these behaviors may indicate stress, discomfort, or unsuitable conditions, making observation a useful tool for monitoring overall well-being.

Do Bronze Corydoras remember interactions?
They have recognition of routine and companions, associating familiar fish or human presence with comfort and food. This memory supports repeated affectionate behaviors, reinforcing bonds and predictable social patterns over time.

How long should I observe to understand their social bonds?
Consistent daily observation for several weeks provides clarity. Watching resting, swimming, nudging, and playful patterns helps identify preferred companions, social hierarchies, and individual personalities, giving a full picture of affectionate behaviors and comfort levels.

Can affection behaviors indicate readiness to explore new areas of the tank?
Yes. Fish that feel secure with companions are more likely to investigate new sections of the tank together. Confidence in their social group encourages exploration, demonstrating trust and comfort within both their environment and each other.

Are affectionate behaviors linked to lifespan?
Affectionate behaviors reflect comfort and low stress, which indirectly support health and longevity. Fish that can freely express social tendencies in a stable environment are more likely to maintain good physical and mental well-being over time.

Can stress permanently reduce affectionate behaviors?
Prolonged or severe stress may lead to lasting changes in social interaction. Early intervention and stable conditions usually restore normal affectionate behaviors, but chronic issues may reduce frequency or intensity.

Do all Bronze Corydoras show the same affectionate patterns?
Patterns are generally similar, but individual personalities, age, and past experiences create variation. Some are more playful or social, while others display subtler behaviors, making careful observation key to understanding each fish’s tendencies.

How do water temperature changes affect affection?
Sudden fluctuations increase stress, reducing playful interactions, close swimming, and nudging. Maintaining stable, appropriate temperatures ensures consistent social behavior and allows fish to display natural affectionate tendencies reliably.

Can affection behaviors indicate adaptation to a new tank?
Yes. Gradual emergence of swimming together, nudging, and resting near companions signals increasing comfort. Rapid acclimation is rare; consistent observation helps track progress and ensures the fish are adjusting safely and confidently.

Are affectionate behaviors influenced by light cycles?
Yes. Consistent day-night cycles help regulate activity, feeding, and social behaviors. Disrupted lighting can reduce interaction, rest patterns, and play, making affectionate behaviors less visible until normal cycles resume.

Do water flow and filtration impact these behaviors?
Moderate flow supports exploration and swimming without causing stress. Strong currents can reduce interaction or lead to hiding, while inadequate filtration may affect water quality, indirectly limiting comfort and affectionate behaviors among Bronze Corydoras.

Can affection behaviors be used to introduce new fish?
Observing social tendencies helps gauge tank dynamics before adding fish. Knowing which individuals are bonded or dominant allows strategic placement, minimizing stress and supporting smoother integration while maintaining affectionate behaviors.

Are affectionate behaviors more visible in certain tank setups?
Yes. Tanks with open swimming space, hiding spots, and calm conditions allow for clear observation of nudging, synchronized swimming, and resting behaviors. Overcrowded or highly decorated tanks may hide these behaviors, though they still occur subtly.

Do these behaviors indicate intelligence?
Yes. Coordinated swimming, playful interactions, nudging, and response to human presence demonstrate learning, memory, and social awareness, reflecting cognitive abilities beyond instinctive behaviors.

Can affectionate behaviors help with breeding success?
Strong bonds and synchronized interactions improve coordination during spawning. Close swimming, nudging, and trust within the group support successful mating, indicating that natural social behaviors positively impact reproductive outcomes.

Do they show affection differently in planted vs. bare tanks?
Planted tanks provide security, hiding spots, and structured space, encouraging more visible affectionate behaviors like resting together, synchronized swimming, and playful interactions. Bare tanks may reduce comfort, making subtle signs harder to observe but still present.

Are affectionate behaviors influenced by water hardness or pH?
Yes. Stable, appropriate parameters reduce stress, encouraging social interactions. Fluctuating or extreme conditions can inhibit swimming together, nudging, and resting behaviors, limiting the expression of natural affection and comfort within the group.

Can observing affection help prevent aggression?
Yes. Recognizing bonded pairs or preferred companions allows careful tank management. Avoiding disruptions, respecting personal space, and maintaining group integrity minimizes conflict, supporting peaceful interactions and overall well-being.

Do affection patterns change as fish age?
Older fish may show less active play but maintain resting, nudging, and proximity behaviors. Social bonds persist, though energy and activity levels naturally decline, requiring observation to ensure comfort and continued group harmony.

Can affectionate behaviors indicate overall tank harmony?
Yes. Frequent synchronized swimming, gentle nudges, resting together, and responsive interaction signal a stable, low-stress environment. Monitoring these behaviors provides insight into both individual and group well-being, guiding adjustments to maintain comfort and safety.

Are there behaviors that mimic affection but signal stress?
Some behaviors, like staying close under cover or following rapidly, may appear social but indicate fear or stress. Context, posture, and accompanying signs help differentiate true affectionate behaviors from stress responses.

How can I track affectionate behaviors effectively?
Keeping notes on resting locations, nudging frequency, swimming patterns, and interaction with companions allows observation of trends over time. Regular tracking highlights preferences, social bonds, and any deviations that may signal stress or environmental issues.

Do these behaviors vary between day and night?
Yes. Corydoras are more active during daylight periods, showing synchronized swimming, playful nudging, and exploration. Nighttime generally sees reduced movement and more resting near companions, reflecting natural circadian rhythms.

Can affection behaviors be influenced by seasonal feeding changes?
Gradual changes in diet or feeding frequency can alter activity levels and interaction. Maintaining consistent routines supports predictable social behaviors and encourages continued affectionate displays.

Are affectionate behaviors permanent?
They are consistent as long as comfort, safety, and group stability are maintained. Environmental stressors, health issues, or significant tank changes can temporarily or permanently alter behavior patterns. Stable conditions help maintain predictable expressions of affection.

Do Corydoras show preference for certain tank regions?
Yes. Preferred areas often combine open swimming space and nearby hiding spots. Fish may repeatedly return to these regions to rest, swim closely with companions, or play, demonstrating comfort and habitual bonding within familiar territory.

Can these behaviors be used to assess new tank introductions?
Observing which fish bond or avoid each other provides insight before adding new individuals. Understanding social preferences helps prevent stress and ensures smooth integration while preserving affectionate behaviors among existing group members.

Do Bronze Corydoras interact differently with older or younger tank mates?
Younger or more active tank mates may stimulate playful interactions, while older or reserved fish may prefer resting or gentle proximity. Observing these differences allows better management of group dynamics and comfort for all fish.

Are there indicators that a Corydoras is forming a bond?
Repeated proximity, synchronized swimming, gentle nudging, and consistent resting near the same companion are clear indicators. Monitoring these behaviors shows which fish form strong social bonds and which may remain more solitary.

Final Thoughts

Bronze Corydoras are gentle and social fish that display affection in subtle but clear ways. Observing their behavior closely helps to understand these signals. Actions such as swimming together, resting near companions, gentle nudges, and playful interactions indicate comfort, trust, and a strong connection within the group. These behaviors are natural expressions of their social instincts and can provide insight into their overall well-being. Watching these interactions over time allows aquarists to recognize which fish form bonds and which prefer more solitude. Each individual shows personality through its interactions, making careful observation an essential part of responsible care. Understanding these patterns also helps in maintaining a peaceful tank, as recognizing social hierarchies and preferred companions reduces stress and potential conflicts.

Affectionate behaviors are influenced by environmental factors, such as tank size, water quality, and the presence of hiding spots. Stable water conditions, consistent feeding routines, and a safe environment encourage these behaviors to emerge more naturally. Bronze Corydoras rely on a sense of security to express trust and engage with companions. Providing sufficient space for swimming, soft substrate, and sheltered areas supports both comfort and social activity. These conditions allow fish to rest near each other, explore in groups, and interact playfully without feeling threatened. Observing when and where these behaviors occur can guide adjustments in tank setup, helping to maintain optimal conditions. Even small changes, like adding plants or adjusting decorations, can impact their interactions, making it important to monitor their responses carefully. Ensuring these elements are present creates a balanced environment in which Bronze Corydoras feel safe to form bonds.

Individual personalities also affect how affection is displayed. Some fish may be more outgoing, actively engaging in nudging or synchronized swimming, while others remain reserved, showing subtle signs of connection through proximity or resting patterns. These differences highlight the need for patience and attentive observation when interpreting behavior. Over time, bonds within the group may become stronger as fish learn to trust each other and their environment. Watching these interactions provides both practical insights for tank management and a deeper appreciation for their social nature. By understanding and supporting these behaviors, aquarists can create an environment that nurtures the health, comfort, and happiness of Bronze Corydoras, allowing them to thrive both individually and as a group.