gray wren-warbler Calamonastes simplex

A very dark, long-tailed warbler of dry country. Blackish-gray overall with a reddish eye and white tips to the tail. With a good look, barring on the throat, belly, and vent may be visible. The tail is frequently cocked up. Generally common in dry thorn savanna and thornscrub. Usually stays in the understory, but will sing from the tops of bushes and small trees. Similar in shape to Miombo Wren-Warbler, but much darker, with virtually no overlap in range. The main vocalization is a loud “chup,” repeated about once per second.