Bovagriff

More commonly called a cuckoo-cow. Just as a hippogryph is the product of a horse and a eagle, a bovagriff is the product of a cuckoo bird and a cow: a cuckoo-cow. The cuckoo-cow has the head, wings, and tail of a cuckoo bird, and the body and limbs of a cow. It is known to lay its eggs into the nests of other egg-laying species. The egg's size always matches the other eggs, and the cuckoo-cow produced is of proportional size. Milking a bovagriff comes with its own challenges, as it often occurs at altitude.