Vilcabamba tapaculo Scytalopus urubambae

Tiny dark gray bird with a short tail; looks like an ashy ping pong ball with legs. Distinguished from similar tapaculos by unmarked chestnut rump and flanks, as well as by voice. Locally distributed in humid mossy Polylepis forest with boulders, where it forages singly or in pairs on and near the ground. Its song is a series of froggy notes, “keerp, keerp, keerp,” given at a steady pace of about two notes per second.