The green kingfisher (Chloroceryle americana) is a species of "water kingfisher" in the subfamily Cerylinae of the family Alcedinidae. It is found from southern Texas in the United States south through Central America, in every mainland South American country except Chile and Trinidad and Tobago.
The green kingfisher inhabits wooded shorelines of streams and freshwater ponds and lakes. It favors still or slow-moving water, and though it requires low vegetation for hunting perches it generally prefers relatively open habitat rather than dense forest. It is a year-round resident throughout its range but roams a territory that may be as much as 1 km (0.6 mi) or more of river.
The Green kingfisher usually hunts from a perch from which it dives into water for its prey. The perch is typically about 1 to 1.5 m (3 to 5 ft) high; it may be directly over water or within a few meters of its edge. In a study in Amazonia about half of the perches were bare snags and the rest were a mix of leafless and leafy trees and bushes. It usually shifts perches after each foray. Occasionally it hovers before diving, sometimes from as high as 6 m (20 ft). Pairs often defend feeding territories from other green kingfishers but seldom from other kingfisher species.
The prey is mostly small fish but includes crustaceans such as shrimp and also adult and nymph aquatic and terrestrial insects. The size of the fish taken varies, apparently with availability and the presence of other species of kingfishers. Studies have published sizes as 8 to 80 mm (0.31 to 3.1 in), as averages of 19.4 mm (0.76 in) and 41.1 mm (1.6 in) at different sites, and as "seldom exceeding a length of two inches".
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The green kingfisher's breeding season varies geographically. In Central America it is during the dry season of spring and early summer. In Suriname and Guyana, it usually extends to August and occasionally to December or beyond. Breeding dates further south have not been documented. Both members of a pair excavate a nest burrow, almost always in an earthen bank of a stream or river. It is up to 1 m (3 ft) long with a small nest chamber at the end. The clutch size varies from two to six. The incubation period is 19 to 21 days; usually the female incubates at night and the parents alternate during the day. The young fledge 26 to 27 days after hatching and the parents chase juveniles from their territory about 29 days after fledging.
