鲍鱼tv

The cool, damp forests of the American Appalachian mountains hide a kind of cockroach that stays in a family group for up to three years. They're found in rotten logs, only eating rotten wood which is plentiful. With so much food within reach, why would the young be so dependent on their parents? The reason is that wood is almost impossible to digest. Cockroaches can only break it down with the help of microbes that live in their gut. Without these microbes, the cockroaches could be surrounded by food and still starve to death. The young cockroaches must get these microbes from their parents, and to do that they must eat their parents' faeces. As the young roaches grow, they moult, and when they moult, they also lose the lining of their gut and their vital microbes. They have no choice but to stay with their parents - without them they would die.