About Ramphocaenus melanurus Vieillot, 1819
This species has the scientific name Ramphocaenus melanurus Vieillot, 1819, commonly known as the trilling gnatwren. Adult trilling gnatwrens measure 12–13 cm (4.7–5.1 in) in length and weigh 8–11 g (0.28–0.39 oz). They have a long, thin bill and a short, held-up cocked tail. Their upperparts are grey-brown, with rufous coloring on the sides of the head. Their throat is white, which gradually shifts to a buff shade across the rest of their underparts. The tail is black, with white tips on all feathers except the central pair, and this tail is frequently wagged. The subspecies R. m. trinitatis, found in eastern Colombia, Venezuela, and Trinidad, has paler underparts, plus buff coloring on the flanks and sides of the head. The species' call is a trilled drdrdrdrdrdrdrdrdr. This bird lives in the undergrowth and vines of dry forest and secondary woodland, across a range extending from Mexico south to Peru and Brazil, as well as on the island of Trinidad.
