Family Tyrant-flycatchers (Tyrannidae)

Least Concern

Sibilant Sirystes (Sirystes sibilator)


French: Tyran siffleur German: Olivrücken-Kappentyrann Spanish: Mosquero silbador

Muscicapa sibilator


, 1818,

Río Plata, Paraguay


Until recently considered conspecific with S. albogriseus, S. albocinereus and S. subcanescens, but detailed review#R indicates significant differences among these forms (see those species). Two subspecies recognized.

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).
  • Descriptive notes

    18–18·5 cm; 26·1–34·5 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

    Recommended citation

    Scholes, E. & Kirwan, G.M. (2019). Sibilant Sirystes (Sirystes sibilator). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 8 December 2019).