Animal Behaviour is the scientific study of what animals do and the mechanisms, development, ecological functions and evolutionary processes underlying those actions. Behaviour includes movement, feeding, communication, mating, parental care, aggression, social interaction, migration, predator avoidance, learning and responses to environmental conditions. Behaviour can be examined at several levels, from immediate physiological mechanisms to evolutionary consequences. A major conceptual framework divides behavioural explanations into proximate and ultimate questions.
Proximate explanations concern how behaviour is produced through mechanisms such as hormones, nervous systems, sensory inputs and development, while ultimate explanations concern how behaviour affects survival and reproduction and how it may have evolved. Animal Behaviour is therefore broader than simply observing visible actions because it investigates causes, consequences and evolutionary history.
Innate behaviour is behaviour that develops through inherited biological mechanisms without requiring a particular form of individual learning, although environmental conditions can influence its expression. Reflexes, fixed action patterns and some orientation behaviours provide examples of relatively strongly inherited behavioural tendencies. Learned behaviour results from experience and can include habituation, classical conditioning, operant conditioning, observational learning and more complex forms of problem solving.
The distinction between innate and learned behaviour is not absolute because many behaviours result from interactions between genetic predispositions and environmental experience. Developmental processes can alter behavioural responses as neural circuits mature and individuals encounter different social and ecological conditions. Behavioural plasticity allows animals to modify actions according to changing circumstances, potentially improving survival in variable environments.
Animal communication involves the transmission of information between individuals through signals. Signals can be visual, auditory, chemical, tactile or electrical depending on the sensory capacities of the species. Birdsong can function in mate attraction and territory defence, while chemical signals in many mammals and insects can convey information about reproductive status, identity or territory. Honeybees use movement patterns to communicate information about food locations within their colonies.
Communication signals can evolve because both senders and receivers influence selection on signal design. Signals may honestly reflect characteristics such as strength or reproductive condition, but they can also be deceptive when deception provides a fitness advantage. The study of communication therefore considers signal production, perception, information content, context and evolutionary costs and benefits.
Feeding behaviour reflects interactions among energetic requirements, sensory systems, environmental resources and ecological risks. Animals must obtain sufficient nutrients while avoiding predators and sometimes competing with members of their own or other species. Optimal foraging theory examines how animals may balance the energetic benefits of food against costs such as search time, handling time and predation risk. Real animals do not always behave according to simple optimisation models because cognition, social information, constraints and environmental uncertainty can alter decisions. Feeding behaviour can also influence ecosystems by determining which plants or prey are consumed and how nutrients move through food webs. Specialised feeding strategies can lead to morphological and behavioural adaptations, while generalist feeding can allow animals to exploit diverse resources in changing environments.
Reproductive Behaviour includes mate choice, courtship, competition, mating systems, parental care and allocation of reproductive effort. Individuals may choose mates according to traits associated with health, condition, compatibility or access to resources. Sexual selection can favour traits that increase mating success even when those traits carry survival costs. Competition among individuals can produce displays, territorial behaviour or direct physical contests.
Mating systems vary from monogamy to polygyny, polyandry and other arrangements, and social mating systems do not always correspond exactly to patterns of genetic parentage. Parental care also varies enormously among species. Some animals provide extensive care for offspring, while others produce large numbers of young with little post reproductive investment. These differences reflect ecological conditions, offspring vulnerability, resource availability and evolutionary trade offs.
Social Behaviour describes interactions among individuals of the same species and can include cooperation, dominance, territoriality, affiliation, conflict and collective movement. Social groups can provide benefits such as protection from predators, improved access to information, cooperative defence and assistance in raising offspring, but they can also increase competition for food and mates and facilitate disease transmission. Dominance hierarchies can influence access to resources, although social organisation differs widely among species.
Kin selection and inclusive fitness theory help explain some forms of apparently altruistic behaviour when helping relatives can increase the transmission of shared genes. Reciprocal cooperation can also evolve when individuals repeatedly interact and can benefit from future assistance. Social behaviour is therefore shaped by both ecological conditions and evolutionary consequences.
Learning and cognition allow animals to modify behaviour according to experience. Habituation occurs when repeated exposure to a harmless stimulus produces a reduced response. Conditioning links stimuli or actions with consequences, while observational learning allows individuals to acquire information by watching others. More complex cognitive abilities can involve memory, spatial representation, problem solving, numerical discrimination or flexible decision making.
Comparative studies must be designed carefully because apparent intelligence can reflect sensory specialisation or ecological adaptation rather than a single general cognitive capacity. Behavioural experiments often distinguish between the ability to perform a task and the motivation to perform it. Cognition is particularly important in environments that change rapidly because learned responses can allow animals to adjust without requiring genetic change across generations.
Animal Behaviour is closely connected to ecology and evolution because behavioural decisions influence survival, reproduction, population dynamics and species interactions. Migration can determine access to seasonal resources, territoriality can affect population density, and predator avoidance can influence habitat use. Behaviour can also change in response to human activity, including artificial light, noise, habitat fragmentation, hunting and urbanisation. Some species alter activity times or movement routes in human dominated environments, while others are unable to adapt sufficiently.
Behavioural research therefore contributes to wildlife management, conservation, animal welfare and ecological forecasting. Important misconceptions include assuming that behaviour is either entirely instinctive or entirely learned and assuming that every behaviour has been consciously chosen. Scientific explanations instead examine mechanisms, developmental history, ecological context and evolutionary consequences together. Animal Behaviour consequently provides a detailed framework for understanding how animals interact with their environments and with one another.
