What helps a caterpillar to crawl on oak leaves? What coloring helps them hide from titties? Why does a hawk have large claws?

1 Caterpillars have small legs that push them forward. But at the ends of these legs there are even smaller hook claws with which the caterpillar clings to the surface and does not fall down.
2 Coloring. Each type of caterpillar is unique in this case. There are inconspicuous caterpillars of brown, green, beige. It all depends on what environment they live in. In our latitudes for caterpillars, the classic is light green, green, dark green colors. There are also individuals of all kinds of shades of brown. It is thanks to these flowers that they merge with the environment (tree and foliage) and avoid the attacks of tits and other birds.
3 The hawk is a bird of prey. It feeds on everything that is less than it. Mainly, the diet includes: small birds, fish, amphibians, reptiles, rodents, insects. The hawk does not fly long in the air. He swiftly dives at the victim and bites into it with claws. That is why they have long sharp claws that can easily pierce the skin of prey.