奇速英语

动物：我有我的保护色

Different animals or pests have their particular colors. Why?

Particular colors will protect themselves. For example, birds, especially seagulls, are very fond of locusts, but birds can't easily catch locusts because locusts change their colors together with the change of the color of crops. When crops are green, locusts look green. But when crops are ripe, locusts take on exactly the same brown color as crops have. Some other pests with different colors from plants are usually easily found and eaten by their enemies. So they have to hide themselves for lives and appear only at night.

The main use of color is to protect themselves. Bears, wolves and the other beasts move quietly through forests. They are usually invisible to eyes of hunters, because they have the color much like the barks of trees.

An even more strange act remains to be noticed. A kind of fish living in seas can send out a kind of very black liquid. When it faces danger, its enemies cannot find it, and it quickly swims away. Thus, it has existed up to now though it is not powerful.