Northern beardless tyrannulet

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Northern beardless tyrannulet
Northern Beardless-Tyrannulet (18560065092).jpg
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Tyrannidae
Genus: Camptostoma
C. imberbe
Binomial name
Camptostoma imberbe
  • C. imberbe imberbe
  • C. imberbe ridgwayi
  • C. imberbe thyellophila
Camptostoma imberbe map.svg

The northern beardless tyrannulet (Camptostoma imberbe) is a small passerine bird in the tyrant flycatcher family. It breeds from southeasternmost Arizona and Texas of the United States through Mexico and Central America to northwestern Costa Rica.

This species is found in light forests, cultivation and gardens with trees. The domed nest is made of plant fibre or leaves with a side entrance. The nest is placed by a tree fork. The typical clutch is two white eggs, which are marked with rufous and lilac mostly at the larger end. Incubation by the female is 14–15 days to hatching, with another 17 days to fledging.

The northern beardless tyrannulet is 10.2 cm (4.0 in) long, and weighs 7.5 g (0.26 oz). The head is dark brown with an erectile crest and pale supercilium. The upperparts are grey-green becoming paler on the rump. The wings are brown with yellow feather-edging and two whitish wing bars. The tail is brown, the throat grey, the breast yellowish, and the abdomen yellow. The bill is pinkish.

Sexes are similar, and this species always appears not as bright, especially with regard to the wing bars, as the closely related southern beardless tyrannulet, C. obsoletum, with which it was once considered conspecific. However, the two forms overlap without interbreeding in Costa Rica.

Northern beardless tyrannulets are active birds, feeding in a vireo or warbler-like fashion on insects, spiders and berries. The call is a loud whistled Fleeeeeerrr, sometimes broken up as a fleeer-it, or a flee-flee-flee-flee. In courtship, or when alarmed, the crests are raised, the tail flicked, and an excited call is made.


  1. ^ BirdLife International (2012). "Camptostoma imberbe". IUCN Red List of Threatened Species. 2012. Retrieved 26 November 2013.
  • Stiles, F. Gary; Alexander Frank Skutch (1989). A Guide to the Birds of Costa Rica. Cornell University Press. ISBN 978-0-8014-9600-4.

External links[edit]