Southern Tropical Pewee

The southern tropical pewee (Contopus cinereus) is a small passerine bird in the family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Bolivia, Brazil, and Paraguay. == Taxonomy and systematics == The southern tropical pewee's taxonomy is unsettled. The International Ornithological Committee (IOC), the Clements taxonomy, and BirdLife International's Handbook of the Birds of the World (HBW) treat it as a species with two subspecies: the nominate C. c. cinereus (Spix, 1825) and C. c. pallescens (Hellmayr, 1927). The North and South American Classification Committees of the American Ornithological Society treat those subspecies and six others as the tropical pewee with the binomial Contopus cinereus. In 2016 HBW separated three of the subspecies as the two-subspecies southern tropical pewee (C. cinereus) and the monotypic western tropical pewee (C. punensis). In 2022 Clements recognized the southern tropical pewee as a species and the IOC followed suit in 2023. == Description == The southern tropical pewee is 13.5 to 14.5 cm (5.3 to 5.7 in) long and weighs about 10 to 15 g (0.35 to 0.53 oz). The sexes have the same plumage. Adults of the nominate subspecies have a dark blackish gray crown with a slight crest, white to grayish…