Chocolate-vented Tyrant

The chocolate-vented tyrant (Neoxolmis rufiventris) is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Chile, and Uruguay, possibly in Paraguay, and as a vagrant to Brazil. == Taxonomy and systematics == The chocolate-vented tyrant has a complicated taxonomic history. It was formally described in 1823 as "Tyrannus Rufiventris". Later in the nineteenth century and into the twentieth other authors placed it variously in genera Myiotheretes, Taenioptera, and Xolmis. In 1927 it was moved to newly erected genus Neoxolmis. Studies published in 2020 placed it in genus Nengetus. The South American Classification Committee of the American Ornithological Society (SACC) retained it Neoxolmis. The IOC and the Clements taxonomy soon agreed with that assignment. However, as of December 2024 BirdLife International's Handbook of the Birds of the World retained the species in Xolmis. The chocolate-vented tyrant is monotypic. == Description == The chocolate-vented tyrant is 20 to 23 cm (7.9 to 9.1 in) long and weighs about 77 g (2.7 oz). The sexes have the same plumage. Adults have a mostly ashy gray face with blackish in front of the eye and on the ear coverts. Their upperparts are brownish gray. Their wing coverts…