What are the benefits of cuckoos?

These small birds live in the forest. Cuckoos kill many pests such as caterpillars and silkworms. This is their benefit. But these birds also do dirty tricks, throwing their eggs into the nests of other birds. Outwardly, the cuckoo looks a bit like a small hawk. Her legs are yellow, and her beak is black. The wingspan of this bird is fifty-five to sixty-five centimeters. They weigh from eighty to one hundred and ninety grams.