 Dear students, in this topic we shall discuss the social behaviours of animals. The social behaviours make a set of interactions among individuals of the same species. A wide range of sociality is observed in some animals. Some animals rarely interact with one another. For example, mosquitoes and polar bears. Such animals are called asocial animals, i.e. these are not social animals. Social animals which live together in large groups are formed tightly knit colonies. For example, ants and termites, bees and wasps, many birds, wildebeests, wolves and lions, monkeys and gorillas and subsebara social animal, human. Dear students, now we shall discuss some characters of social behaviour. Most social behaviours are based on cooperation, competition, conflict, exchange, coercion or sacrifice. Most social animals cooperate with each other to accomplish some task. Many social behaviours are adaptive. They increase animals' fitness and reproductive success. Animals in groups show joint aggregation against the predators. Joint aggregation means that they fight against predators. Many social behaviours are agonistic and they are based on competition among themselves. Such behaviours are selfish behaviours and individuals benefit at the expense of benefit of the other. Most social adaptations benefiting one individual may also indirectly harm others. For example, an individual does not want to harm others, but it has a greater capacity of foraging. He eats more and eats more quickly. This indirectly harms other animals for whom less food is left. In addition to all these selfish behaviours, there are some behaviours which are altruistic behaviours or unselfish behaviours, in which one animal favour another animal, even sacrificing its own benefit.