Azure-crowned hummingbird

The azure-crowned hummingbird (Saucerottia cyanocephala) is a species of hummingbird in the "emeralds", tribe Trochilini of subfamily Trochilinae. It is found in Belize, El Salvador, Guatemala, Honduras, Mexico, and Nicaragua.

The azure-crowned hummingbird is 10 to 11.5 cm (3.9 to 4.5 in) long. Males weigh an average of about 5.8 g (0.20 oz) and females average about 5.4 g (0.19 oz). The bills of both sexes of both subspecies have a black maxilla and a dull pink mandible with a black outer third. Within a subspecies the sexes are almost alike. Adult males of the nominate subspecies have a bright metallic blue crown and females a duller blue to greenish blue crown. Both sexes have metallic bronze nape and back. They have greenish bronze to bronze green rump, uppertail coverts, and tail. Their face is mostly bluish green. Their underparts from chin to vent are white with metallic bronze green sides to the breast and duller bronze green flanks. Immatures are similar to the adults but duller, and with grayish buff tips to the uppertail coverts, whitish tips on the outer tail feathers, and a buff wash to the underparts. Subspecies S. c. chlorostephana is somewhat smaller than the nominate. Its plumage is essentially the same as that of the nominate but with a glittering green instead of metallic blue crown.