Sibilant Sirystes

The sibilant sirystes (Sirystes sibilator) is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Bolivia, Brazil, and Paraguay. == Taxonomy and systematics == The sibilant sirystes was originally described as Muscicapa sibilator, mistakenly placing it with the Old World flycatchers. In 1860 the genus Sirystes was erected for it. Some authors included the genus in family Cotingidae but by the 1930s it was placed in its current family. The sibilant sirystes was eventually expanded by what are now the white-rumped sirystes (S. albocinereus) and Todd's sirystes (S. subcanescens); some systems also included what is now the Choco sirystes (S. albogriseus). The combined species was simply called "sirystes". As a result of a study published in 2013, "sirystes" was split into four species. The sibilant sirystes has two subspecies, the nominate S. s. sibilator (Vieillot, 1818) and S. s. atimastus (Oberholser, 1902). == Description == The sibilant sirystes is 18 to 18.5 cm (7.1 to 7.3 in) long and weighs about 26 to 28 g (0.92 to 0.99 oz). The sexes have the same plumage. Adults of the nominate subspecies have a black crown with a slight crest. The rest of their face…