Berylline Hummingbird or Allen's Hummingbird?

General appearance

The berylline hummingbird displays a striking combination of vivid colors, primarily characterized by a shimmering green head and body, transitioning into a bronze to reddish-bronze tone on the back and tail. Their small size, typically 8-10 cm in length, and rapid, agile flight are hallmark features that aid in identification.

Male vs female

Males are noted for their bright emerald green plumage throughout, with a more extensive and vibrant reddish-brown coloration on the tail compared to females. Females exhibit more subdued coloration, with a paler underbelly and less intense iridescence. Both sexes possess a slightly decurved, slender black bill, but males have slightly brighter coloration overall.

Juvenile

Juvenile berylline hummingbirds resemble females more closely, with duller green plumage and less iridescent feathers. They typically lack the striking shine of adult plumage and gradually develop more vibrant colors as they mature. In the field, juveniles can be identified by their muted tones and less defined coloration of the tail and back.

Primary habitat

The primary habitat of the berylline hummingbird is mountain forests and canyons at altitudes of 5,000-7,000 feet, notably within open pine-oak woods or shady canyons with sycamores in Arizona.

Additional range

In Mexico, these hummingbirds are found in the foothills and lower slopes of mountains, especially in oak woodlands.

Natural diet

The berylline hummingbird primarily feeds on nectar, which it collects from a variety of flowers. This nectar provides them with essential carbohydrates for energy. In addition to nectar, the berylline hummingbird also consumes tiny insects. These insects are a vital source of protein, which is important for supporting muscle maintenance and growth, as well as breeding activities.

Bird feeders

In addition to its natural diet, the berylline hummingbird is known to visit bird feeders, particularly those that offer sugar-water mixtures. These feeders mimic the nectar found in flowers and provide an additional source of energy for these birds. While not a natural component of their diet, many berylline hummingbirds frequently enjoy the accessible and abundant food source provided by hummingbird feeders.