The breeding adult black skimmer has brown-black upperparts, contrasting with a white forehead and underparts. The upperwing shows a white trailing edge from the secondaries to the inner primaries. The tail is white, with dark central feathers. The...
It’s not too difficult to find an impassioned vocal advocate for the conservation of bird habitats, but like the trees the birds themselves live in, that voice is mostly bark and little bite on its own. Talking up a good game about preserving the...
The Aplomado Falcon is a distinctive bird of prey; dull red underparts, a grey back, a long and banded tail, and a striking black and white facial pattern distinguish adults. The lower breast sports a broad, blackish band or cummerbund with small...
Plumage and sexual maturation in the Great Frigatebird Fregata minor in the Galapagos Islands Author(s): VALLE, C.A., DE VRIES, T. & HERNÁNDEZ, C. The adaptive significance of distinctive immature plumages and protracted sexual and plumage...
Worldwide Species Action Plans SAP: Shore Dotterel (Thinornis novaeseelandiae) 2001 Language: EN Origin: New Zealand This plan lists the goals that are required to bring about an increase in the population, and to ensure this population is self...
ASPECTS OF THE BIOLOGY OF THE HORNED SCREAMER IN SOUTHWESTERN COLOMBIA Author(s): LUIS G. NARANJO An isolated population of the Horned Screamer (Anhima cornuta) in the Cauca Valley, Colombia, was studied intensively during 1983-1984. Variation of...
A description of nests and behavior of the Gray-headed Kite. Author(s): ROBERT E. BENNETS and VICTORIA J. DREITZ The Gray-headed Kite (Leptodon cayanensis), a little-known Neotropical raptor (Blake 1977, Brown and Amadon 1989, de1 Hoyo et al. 1994);...
Male Incubation in Wilson’s Plover (Charadrius wilsonia) Author(s): PETER W. BERGSTROM Male incubation, defined as exclusive incubation by the male, is thought to be a necessary step in the evolution of polyandry from monogamy in birds. When...
The status of the Gray Hawk in New Mexico Author(s): JOHN P. HUBBARD On 23 April 1876, near Fort Bayard, Grant County, New Mexico, Frank Stephens collected two sets of eggs that he identified as those of the Gray Hawk (Buteo nitidus). Through the...
The Slate-colored Seedeater (Sporophila schistacea): a bamboo specialist? Author(s) Diane L Neudorf & Paul J. Blanchfield The idea of constant density and stable territoriality found in some tropical birds (Greenberg & Gradwohl1986) does not...