Cyanerpes cyaneus is a small bird found across a wide range that includes southern Mexico, Central America, and much of northern and western South America, extending as far south as Bolivia and central Brazil. It inhabits tropical lowland forests, forest edges, plantations, and areas of secondary growth, usually at elevations below 3,000 feet. It adapts well to fragmented habitats and is often seen in gardens, orchards, and shrubby urban zones near forested areas. It is considered plentiful throughout much of its range, with stable populations and a classification of Least Concern by the IUCN. This species has established small non-native populations in southern Florida and Hawaii, introduced through the pet trade or accidental escapes.

Adult males in breeding plumage are striking, with electric blue plumage, a black mask extending from the bill to the upper chest and back, bright orange legs, and a decurved black bill. Non-breeding males and females have greenish-olive plumage, with more subtle coloration and less contrast. Adults typically measure about 5 inches in length and weigh roughly 0.4 ounces. These birds travel in small groups and are often seen actively foraging in the mid to upper canopy. They primarily feed on nectar, fruits, and insects, using a long, brush-tipped tongue to extract liquid food from flowers. They show preference for flowering trees and are known to follow army ant swarms to catch disturbed insects. Their flight is quick and direct, with rapid wingbeats.

Breeding occurs throughout the year in tropical regions, with slight seasonal peaks depending on rainfall. Nests are shallow cups made of plant fibers and placed in low shrubs or tree branches. The clutch usually consists of two eggs, which the female incubates alone while the male continues to forage nearby. Cyanerpes cyaneus is occasionally seen in the exotic pet trade, particularly in countries such as Colombia, Brazil, and Panama. Photographed in northern Colombia.