Each insect in a colony seemed to have its own agenda，and yet the group as a whole appeared to be highly organized.This was most apparent in the way in which ants travel to and from a food source.Ants form and maintain a line to their food source by laying a trail of pheromone，a chemical to which other members of the same species are very sensitive.They deposit a certain amount of pheromone while walking，and each ant prefers to follow a direction where a lot of pheromone can be found.This enables the ant colony to quickly find the shortest route.

　　The social behaviour of ants is among the most complex in the insect world.They communicate by touch and smell，constantly touching each other to pass on their nest odour.There are also some fairly aggressive tendencies exhibited by many ants.For example，ants have the ability to take over the nest of other ant species.The queen will attack and kill the queen of other species，and then cover herself with the odour of the other queen so she will be accepted by the colony residents.

　　All ants have amazing design features.They have two sets of jaws—the outer pair is used for carrying objects and for digging，while the inner pair is used for chewing.Some ants can lift food items that are up to seven times as heavy as themselves.They control the population numbers of many other species.Ants can eat animals，plants，and even the seeds of many plants.

　　Actually，according to what scientists have investigated，ant’s highly complex social structure，life cycle，strength，are all said to be the result of evolution.

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