 Dear students, in this topic we shall discuss the social behavior of living in groups. The animal populations are often organized into groups. These groups may be simple aggregation of individuals or these groups may form complex animal societies. An aggregation is any form of gathering of animals or the process of coming together. There is minimal interaction between the members of an aggregation. For example, several drosophila flies come on a rotting fruit, they are cut, they work and there is no social interaction between them. This is an example of aggregation. Animal societies are a stable group of individuals, in which the members of a species are closely knit together and have cooperative social relationships. Societies of animals have complex social organization and the sphere of a society extends beyond the purposes of only reproduction or rearing of the or caring of the young. Here students, now we shall discuss the advantages of social grouping. The first advantage is protection from predators. The second advantage is that the warning signals are spread rapidly in a society. Moreover, the social grouping increases the feeding efficiency by cooperative hunting and food search. Similarly, social grouping helps to protect from harsh cold environments by social hurdling. In the winter, many animals form a group and in the form of a group, the cold impact decreases. Social grouping is also helpful in finding mates and rearing of the young. However, there are certain disadvantages of social grouping. In a social group, competition is developed for resources, for food and for mates. However, diseases and parasites spread more rapidly among the members of a group. Social grouping, where reproductive and rearing of young ones benefit, increases the social interference in these processes. Which is not like by many members of a group. Similarly, by predation, in the form of aggregation, there are chances of getting preyed upon. Because when a large group of animals and a prey attack on them, then a lot of members will be left, but some of them become prey. So it increases the risk of predation.