French: Tyran siffleur German: Olivrücken-Kappentyrann Spanish: Mosquero silbador
Río Plata, Paraguay
Subspecies and Distribution
S. s. atimastus
Oberholser, 1902 – Chapada, in Mato Grosso (Brazil).
S. s. sibilator
(Vieillot, 1818) – C & SE Brazil (S Pará [rare], Maranhão and Bahia S to Rio Grande do Sul), E Paraguay (E from Amambay and Paraguarí) and NE Argentina (Misiones, NE Corrientes).
18–18·5 cm; 26·1–27·5 g. Nominate race has black crown with slight crest, becoming slate-grey on side of head; back mottled olivaceous grey (... read more
Loud ringing “wheer-péw”, sometimes lengthened into excited-sounding series,... read more
Canopy of forest and mature secondary woodland, including cerradão, riparian and... read more
Food and feeding
Feeds on fairly large insects; fruits also taken. Often in pairs; accompanies mixed-species flocks in forest canopy, usually being the... read more
Virtually no published information, but in S Brazil (Rio Grande do Sul) birds collected in Aug and Oct were coming into breeding condition... read more
Mostly resident; possibly migratory in extreme S Brazil (no records in Rio Grande do Sul between... read more
Status and conservation
Not globally threatened (Least Concern). Uncommon to fairly common; locally common. Perhaps most abundant in E Paraguay and SE Brazil where intact forest remains; local... read more
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