What is Variable antshrike?
{{Taxobox | name = Variable Antshrike | image = CHOCA-DA-MATA macho ( Thamnophilus caerulescens).jpg | image_caption = male ''Thamnophilus c. caerulescens'' from [[São Paulo (state)|São Paulo]], Brazil | status = LC | status_system = iucn3.1 | status_ref = | regnum = [[Animalia]] | phylum = [[Chordata]] | classis = [[Aves]] | ordo = [[Passeriformes]] | familia = [[Thamnophilidae]] | genus = ''[[Thamnophilus]]'' | species = '''''T. caerulescens''''' | binomial = ''Thamnophilus caerulescens'' | binomial_authority = [[Louis Jean Pierre Vieillot|Vieillot]], 1816 | synonyms = }} The '''variable antshrike''' (''Thamnophilus caerulescens'') is a species of [[bird]] in the [[Thamnophilidae]] family found most in [[South America]]. It is (as its name) arguably the species of [[antbird]] with the most variable [[plumage]].<ref name=DNA>Brumfield, R. T. (2005). ''Mitochondrial variation in Bolivian populations of the Variable Antshrike.'' Auk 122(2): 414–432</ref> This leads to claims that it includes more than one species, but evidence suggests that this is incorrect.<ref name=DNA/><ref name=clinal>Isler, M. L., Isler, P. R., and Brumfield, R. T. (2005). ''Clinal variation in vocalizations of an antbird (Thamnophilidae) and implications for defining species limits.'' Auk 122(2): 433–444</ref> The Variable Antshrike is about {{convert|14|-|16|cm|abbr=on}} long.<ref name=HBW>Zimmer, K. J., and Isler, M. L. (2003). Variable Antshrike (Thamnophilus caerulescens). Pp. 561-562 in: del Hoyo, J., Elliott, A., and Christie, D. A. eds. (2003). ''Handbook of the Birds of the World.'' Vol. 8. Broadbills of Tapaculos. Lynx Edicions, Barcelona. {{ISBN|84-87334-50-4}}</ref> ==Distribution and habitat== [[Image:Thamnophilus caerulescens-2.jpg|thumb|left|150px|Female ''Thamnophilus c. caerulescens'' from São Paulo, Brazil.]] The Variable Antshrike is found mostly in eastern and southern [[Brazil]]. It is also seen in [[Pernambuco]] and [[Alagoas]]. From southern Brazil, its range spreads through [[Uruguay]], [[Paraguay]], northern [[Ar