Family Tyrant-flycatchers (Tyrannidae)

Least Concern

Hudson's Black-tyrant (Knipolegus hudsoni)


French: Ada de Hudson German: Weißflanken-Dunkeltyrann Spanish: Viudita patagona

Cnipolegus [sic] hudsoni

P. L. Sclater

, 1872,

Río Negro, Patagonia


Formerly separated with K. poecilocercus in Phaeotriccus, on basis of shape of outer primaries; recent phylogenetic study#R confirms that the two are embedded in present genus and are not sisters. Monotypic.


C Argentina from W Córdoba S to E Neuquén, N Río Negro and SW Buenos Aires; migrates N to Bolivia and SC Brazil.

Descriptive notes

15·5 cm. Male plumage is shiny black, underwing with large white patch across inner webs of primaries (conspicuous in flight, not visible when perched); some whitish on lower... read more


Irregular “ric-tic-titireetic” and snapping sounds.


Low wood­land and scrub; also Chaco and overgrown pastures and gardens in non-breeding season.... read more

Food and feeding

Little known. Insects eaten. Usually inconspicuous, preferring dense cover close to ground.


Male displays from emergent, usually dead tree, jumping restlessly from branch to branch, occasionally flying up and vocalizing. Nest an... read more


Migrates N in Aug–Sept to Paraguay, Bolivia and S Brazil; recorded as far N in Mato Grosso as... read more

Status and conservation

Not globally threatened. Generally rare to locally uncommon. Fairly common to common during breeding season in Lihué Calel National Park (La Pampa); has been recorded during... read more

Recommended citation

Farnsworth, A. & Langham, G. (2019). Hudson's Black-tyrant (Knipolegus hudsoni). 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 13 December 2019).