The mangrove hummingbird (Chrysuronia boucardi) is an Endangered species of hummingbird in the "emeralds", tribe Trochilini of subfamily Trochilinae. It is endemic to Costa Rica. == Taxonomy == The mangrove hummingbird was formally described in 1877 by the French ornithologist Étienne Mulsant from a specimen collected by Adolphe Boucard near Puntarenas in Costa Rica. Mulsant placed the new species in the genus Arena and coined the binomial name Arena boucardi. The mangrove hummingbird was formerly placed in the genus Amazilia. When a phylogenetic study published in 2024 found the species was most closely related to the sapphire-throated hummingbird (Chrysuronia coeruleogularis), the mangrove hummingbird was transferred from Amazilia to the genus Chrysuronia. The genus name is a portmanteau of the specific names of two synonyms of the golden-tailed sapphire: Ornismya chrysura Lesson, R, 1832 and Ornismia oenone Lesson, 1832. The specific epithet was chosen to honour the collector Boucard. The species is monotypic: no subspecies are recognised. == Description == The mangrove hummingbird is 9.5 to 11 cm (3.7 to 4.3 in) long and weighs about 4.5 g (0.16 oz). Both sexes have a medium length bill, slightly decurved, with a black maxilla and a reddish mandible with a dusky tip.…
