Blue-crowned trogon
The blue-crowned trogon ("Trogon curucui") is a species of bird in the family Trogonidae, the quetzals and trogons. It is found in Argentina, Bolivia, Brazil, Colombia, Ecuador, Paraguay, and Peru. Taxonomy and systematics. The blue-crowned trogon's early taxonomic history is contorted, but since the mid 1900s it has settled on its current state. Three subspecies are recognized, the nominate "T. c. curucui", "T. c. peruvianus", and "T. c. behni". Description. The blue-crowned trogon is about long and weighs . The male of the nominate subspecies has a blackish face and throat with an orange  ring around the eye. The crown, sides of the neck, and breast are glossy greenish blue, the nape turquoise-green, and the back metallic bronzy green. The upperside of the tail is greenish blue and the underside has black and white bars. The folded wing has fine vermiculation that looks gray at a distance. The breast is separated from the rosy red belly and vent by a white band. The female is gray where the male is green and the belly is pinkish red. Instead of the orange ring around the eye there are white arcs before and after it . The underside of the tail has a different black and white pattern. The male of "T. c. peruvianus" has a bluish gloss to the bronzy green back, a much reduced white breast band, and narrower white bars on the undertail. The male "T. c. behni"s back is more intensely bronze than the nominate's, and the breast is greener. Distribution and habitat. The blue-crowned trogon is found throughout the Amazon Basin south of the Amazon River and south and east from there as well. The nominate subspecies is found from Amazonian central Brazil east to the Atlantic Ocean. "T.  c. peruvianus" is found in the Andean foothills of southern Colombia, eastern Ecuador and Peru, and northwestern Bolivia and from there east into Amazonian Brazil as far as the Tapajós River. "T. c. behni" is found in eastern and southern Bolivia, southwestern Brazil, much of Paraguay, and northern Argentina. The blue-crowned trogon inhabits a variety of landscapes across its large range. Forest types include "várzea", gallery, tall secondary, and dry semi-deciduous. It occupies all levels from the understory to the canopy. It is also found in savanna woodland, dry palm forest, "caatinga", and scrublands. In the northern part  of its range it seldom occurs above of elevation but reaches as high as in Argentina and in Bolivia. Behavior. Feeding. The blue-crowned trogon's diet includes a wide variety of insects and spiders, and also fruits. It sometimes joins mixed-species foraging flocks. Breeding. The blue-crowned trogon's breeding season varies across its range. It starts as early as May in Colombia and spans from October to December in Argentina. It nests in cavities in arboreal termitaria. The clutch size is two or three eggs. Vocalization. The male blue-crowned trogon's song is "a fast, evenly  paced repetition of...'kow' [notes], lasting about 4-5 seconds and ending abruptly". Both sexes give a "churrr" call. Status. The IUCN has assessed the blue-crowned trogon as being of Least Concern, though its population is unknown and is believed to be decreasing. It is rare to common in different parts of its range and occurs in several protected areas in Boliva, Brazil, and Argentina.