Do you knowwhy different animals or insects have their special colors? Colors are u mainly to protect themselves.
Why can't somebirds easily catch locusts（蝗虫）? It is b locusts change their colors together with the change of the colors of crops. When crops are green, locusts l green. But as autumn comes, locusts change to the s brown color as crops have. Some other insects with different colors from plants are easily found and eaten by others. So they h to hide themselves for lives in the day and appear only at night.
I you study the animal life, you'll find the main use of coloring is to protect themselves. Bears, lions and other animals move t forest quietly . They cannot be easily seen by hunters .This is because they have the colors much like the trees.
Have you e noticed an even more strangething? A kind of fish in the sea can send out black liquid(液体) when it faces d. While the liquid spreads over, its enemies can't find it. And it swims away i. So it has lived up to now though it is not strong at all.