The black-throated trogon, also known as yellow-bellied trogon, (Trogon rufus) is a near passerine bird in the trogon family, Trogonidae. Although it is also called "yellow-bellied trogon" it is not the only trogon with a yellow belly. It breeds in lowlands from Honduras south to western Ecuador and northern Argentina. Taxonomy The black-throated trogon was formally described in 1788 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae. He placed it with the other trogons in the genus Trogon and coined the binomial name Trogon rufus. Gmelin based his description on the "Couroucou à queue rousse de Cayenne" that had been described and illustrated in 1779 by the French polymath Comte de Buffon in his Histoire Naturelle des Oiseaux . Buffon's specimen was a female with brown upperparts that had been collected in Cayenne. The specific epithet rufus is Latin for "red" or "ruddy". Six subspecies are recognised: T. r. tenellus Cabanis, 1862 – southeast Honduras to northwest Colombia T. r. cupreicauda (Chapman, 1914) – west Colombia and west Ecuador T. r. rufus Gmelin, JF, 1788 – east Venezuela, the Guianas and north Brazil T. r. sulphureus Spix, 1824 – southeast Colombia, east Ecuador, northeast Peru and west Brazil T. r. amazonicus Todd, 1943 – northeast Brazil T. r. chrysochloros Pelzeln, 1856 – south Brazil, Paraguay and northeast Argentina Description Like most trogons, it has distinctive male and female plumages and with soft colourful feathers. This relatively small species is 23–24 cm long and weighs 54-57 g, with a white undertail with black barring, a yellow bill and wing coverts which are vermiculated with black and white, but appear grey at any distance. The male black-throated trogon has a green head, upper breast and back, black face and throat, and golden yellow belly. The female has a brown head, upper breast and back, rufous upper tail and yellow belly. Immatures resemble the adults but are duller, and young males have a brown throat, breast and wing coverts. The call is a churring krrrrrr, and the song is a typical trogon series of a few clear whistles, cuh cuh cuh cuh. Distribution and habitat It is a resident of the lower levels of damp tropical forests, and prefers the deep shade of the understory. Their broad bills and weak legs reflect their diet and arboreal habits. Although their flight is fast, they