Family Tyrant-flycatchers (Tyrannidae)


Cocos Flycatcher (Nesotriccus ridgwayi)


French: Tyranneau de Cocos German: Kokos-Insel-Tyrann Spanish: Mosquerito de Cocos

Nesotriccus Ridgwayi

C. H. Townsend

, 1895,

Cocos Island, off Pacific coast of Costa Rica


A recent genetic study#R has found present species to be nested within populations of Phaeomyias murina, so that separation in monotypic genus would not be justified. Monotypic.


Cocos I, SW of Costa Rica.

Descriptive notes

11 cm; 11 g. Variably coloured tyrannid with unusually long and broad bill. Above, is greyish-olive to dark brownish-olive, crown like back, faint supercilium slightly paler... read more


Male has two song types, an explosive, dry, descending chatter of 6–9 syllables, speeding up... read more


Humid tropical and subtropical forest and forest edge, second growth, and scrubby and swampy areas... read more

Food and feeding

Arthopods; occasionally fruits. In analysis of 26 stomachs, diet overwhelmingly dominated by fulgoroid homopterans (planthoppers... read more


Jan–Apr. Nest constructed by both sexes, a substantial open cup, outside diameter 7·5 cm, inside 4·5 cm, of plant fibres, fine black... read more



Status and conservation

VULNERABLE. Restricted-range species: present in Cocos Island EBA. Common in most habitats. Estimated population of several tens of thousands, within global range of c. 25 km... read more

Recommended citation

Fitzpatrick, J. (2019). Cocos Flycatcher (Nesotriccus ridgwayi). 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 10 December 2019).