Guanacos, Cordillera Prov., Santa Cruz, Bolivia.
Hitherto treated as conspecific with M. torquatus, but differs in its blacker face, ear-coverts and continuous post-auricular area (neck sides) (1); broader black breastband (1); seemingly (at least on average) slightly darker chestnut vent (ns); rather smaller bill (effect size –2.55 although n=9 for torquatus; allow 2); song typically with a short single song phrase (3), occasionally doubled or tripled, and a faster pace of delivery (2) and always with a trilled note in its song phrases, vs a very long string of repeated subphrases#R. This finding coincides with report in HBW of cytochrome b sequences of the two species differing by 4.4%. Monotypic.
N & C Argentina from E Salta, Jujuy and Formosa S to Mendoza, La Pampa, NE Río Negro and W Buenos Aires; non-breeding also N to SE Bolivia (Tarija) and W Paraguay (Alto Chaco region).
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