About Cynanthus latirostris Swainson, 1827
The broad-billed hummingbird (Cynanthus latirostris Swainson, 1827) is a small hummingbird, measuring around 8–10 cm (3.1–3.9 in) in total length with an average wingspan of 13 cm (5.1 in). Individuals weigh 3–4 grams, with males being slightly heavier than females. This species has a long, bright reddish bill that ends in a black tip. Its dorsal side is metallic green, with duller coloration on the crown and forehead. Broad-billed hummingbirds are sexually dimorphic, meaning adult males and females differ significantly in appearance. Adult males are dark green with white undertail-coverts, a blue throat, a broad blackish-blue tail, and brownish-gray flight feathers. Their bills are shorter but brighter red than those of females, and adult males have larger wings and tails than females. Adult females have a pale belly, a white eyestripe behind the eye, and white-tipped tail feathers. Juvenile coloration generally resembles that of adult females. Over time, juvenile males develop red bills and iridescent throat feathers, and unlike females, juvenile males do not have white-tipped tails. Like males of all age classes, juvenile males have larger wings and tails than females. Newly hatched broad-billed hummingbirds have brown bodies, orange downy feathers, and orange bills. Little is known about wild hatchlings, but captive juvenile broad-billed hummingbirds grow full adult plumage within 6–8 months of hatching. In terms of distribution and habitat, the subspecies C. l. latirostris occurs in the United States, where it inhabits streamsides and oak woodlands. It prefers areas with streamside groves, dense vegetation, and open oak woodlands in lower canyons, and favors locations that contain Arizona sycamore (Platanus wrightii), Fremont cottonwoods (Populus fremontii), and mesquite. Across Mexico, specimens of this species have been collected at nearly all elevations, ranging from 1494 to 3048 meters above sea level. Along Mexico's Pacific coast, the broad-billed hummingbird is a common year-round resident of arid thorn forests, tropical deciduous forests, and riparian gallery forests. During breeding season, the species is most common in desert canyons and low mountain oak woodlands. The broad-billed hummingbird's overall range extends from the southwestern United States south to central Mexico. Breeding has been recorded in southeastern Arizona, southwestern New Mexico, and rarely in southwestern Texas. Rare vagrant sightings have been recorded across the continent, including in Arkansas. In the Mexican state of Sonora, the broad-billed hummingbird is the most common hummingbird species.
