Red-rumped Bush-Tyrant Cnemarchus erythropygius

Attractive gray and chestnut flycatcher with obvious white wing patches. It inhabits high mountains at or above treeline, in open areas where there are only scattered trees and bushes. Sits conspicuously on treetops, posts, wires, and other elevated perches, from which it sallies out to chase insects. It gives a querulous whistle that can be heard over long distances. A scarce bird, but its preference for open habitats and its conspicuous behavior can make it fairly easy to track down if one is present in the area.