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"Cuculus canorus the familiar Cuckoo of Britain and nearly all the Old World, is greyish-brown above and on the throat, the lower parts being white barred with dusky, and the wings and tail shewing a few white markings. A chestnut-brown or "hepatic" phase is sometimes met with. The young are brown mottled with white on the nape."

Cuckoo

"Cuculus canorus the familiar Cuckoo of Britain and nearly all the Old World, is greyish-brown above…

This Old World bird's plumage is gray or brown. They have a long tail, strong legs, and a slim body.

Common Cuckoo

This Old World bird's plumage is gray or brown. They have a long tail, strong legs, and a slim body.