Birds of Zion National Park

The Costa's Hummingbird (Calypte costae) is a species of hummingbird.
The male Costa's Hummingbird's courtship display is a spirited series of swoops and arcing dives, carefully utilizing a proper angle to the sun to show off his violet plumage to impress prospective mates. Each high-speed dive will also pass within inches of the female, perched on a nearby branch, which will be accented by a high-pitched shriek.
Calypte costae is an omnivore, though it feeds mainly on nectar from flowers. Like all other hummingbird species the Costa's Hummingbird feeds on flower nectar and any tiny insects that it happens to find in the flower petals. As with other species, it can slow down its metabolism during cold nights when it enters a hibernation-like state known as torpor and its heart and respiration rate are dramatically slowed.
Northern breeding populations move south for winter. Birds that breed in spring in Arizona migrate probably to Pacific coast to spend summer, return to southwestern Arizona in fall.
Its endangered status is of least concern. less ↑

Anna's Hummingbird (Calypte anna) is a year-round resident along the Pacific coast of North America, breeding north to British Columbia and east to Arizona.
Anna's Hummingbird is 3.9 to 4.3 in (9.9 to 10.9 cm) long. It has a bronze-green back, a pale grey chest and belly, and green flanks. Its bill is long, straight and slender. The adult male has an iridescent crimson-red crown and throat, and a dark, slightly forked tail. Anna's is the only North American hummingbird species with a red crown. Females and juveniles have a green crown, a grey throat with some red markings, a grey chest and belly, and a dark, rounded tail with white tips on the outer feathers.
In the male's courtship display, he hovers in mid-air giving a buzzy song, then flies much higher before diving steeply and rapidly toward the female, making a loud explosive popping sound at the bottom of his dive.
The nest of an Anna's Hummingbird, is usually constructed on a branch of a tree or shrub, but may also be in vines, on wires, or under eaves. It is typically 1 to 8 m above the ground. Built by the female alone,it is a cup of plant fibers and spider webs. It is lined with fine plant down (and sometimes feathers) and the outside is camouflaged with lichens. less ↑