Humans or animals have resident that it is living area and their food resource .
Then, they have to protect and keep it far from enemies who attract to replace owner. A herd of lions have a male lion who is a leader and fight with opponent. They tried to serve living area that they spend their life, ants leave the nest and fight with opponent who cover their nest. It is the spirit of animals which happen by nature, they didn't learn or practice.
Other reasons find out a mate for extend generation. Groups of mate Frog sing to attract females that they gather in a big group to attract more females per male them smaller group, making it easier for the males to find a mate. Flock of birds, the young can be reared more safely in social groups for example in a colony tend to lay their eggs at around the same time, so all the chicks emerge from the egg almost simultaneously. The predator can only consume a finite number or chicks, each individual is less likely to be eaten.
A group that spread out in search of food is likely to be more successful than an animal searching alone. When one has found food, other may simply join it, but some species have developed a highly complex form of communication; When a honeybee finds some food it returns to its hive and perform a complex dance to indicate the location of the food to other.
In the past, Human usually built community with together in village for advantage to enemies protecting. Country of Thailand, people built their house around other house assemble village from village will be city because of safe of them. In addition, they join together for working in field plant rice and gather product theirs. Then, social co-operation get advantage to people who assemble with association.
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