白蚁、蚂蚁、蜜蜂这一类“社群性”生活的昆虫,群体有大有小,大的可达200万或更多的个体,小的可以几十个,上百个组成一个群体。不论其大小如何,内都存在着形态有别,职能各异的品级或阶层(Castes),如蜜蜂群内有蜂王、雄蜂、工蜂之分,白蚁巢里有蚁王、蚁后、兵蚁、工蚁之别。各品级组成一个完整的群体,按一定比例维持巢群的繁荣。若巢群内的品级某一部份受损, Termites, ants, bees in this category “community ” living insects, large and small groups, up to 2 million or more large individuals, small can dozens, hundreds of a group . Regardless of its size, there are different forms and functions of different grades or classes (Castes), such as honey bee swarm within the queen, drones, worker bees, termites in the nest there are queen, queen, soldier, Other workers ants. Each grade constitutes a complete group, according to a certain percentage to maintain nest prosperity. If a certain part of the nest within the group damaged,