uropygium

The posterior part of a bird’s body, from which the tail feathers grow.

In ornithology, the rump; the terminal section of the body, represented by the caudal vertebræ, into which the tail-feathers are inserted; also, the upper surface of this part, or terminal section of the notæum, with limits not defined. See cuts under bird and elæodochon.

The prominence at the posterior extremity of a bird’s body, which supports the feathers of the tail; the rump; — sometimes called pope’s nose.

The posterior part of a bird‘s body from which the tail feathers grow

posterior part of a bird’s body from which the tail feathers grow