The Cuckoo (Cuculus canorus) is the most recognizable bird that appears in the spring by its voice. He comes back to us from Africa at the beginning of May and immediately calls loudly. The Cuckoo does not build its own nests, but is a breeding parasite. The female throws her eggs into the nests of smaller passerine birds. Each female lays one egg to the species' nest whose eggs are similar to her own. These are most often nests of pipit, wagtail, warbler, red-backed sand and reeds. After hatching, the cuckoo chick removes other eggs or chicks from the nest and is fed by its adoptive parents. When it grows up, it is several times bigger than its adoptive parents. She returns to Africa alone, but without any mistakes she returns to the lair the next year and practices the same practice as her genetic parents - throwing her eggs into the nests of other birds.