Factors such as weather, length of daylight, & fat accumulation stimulate migration for the Broad-tailed hummingbird.
Sexes apparently migrate separately; older males first to arrive and to depart. Hummingbirds migrate alone, not in flocks, and not on the backs of geese!
Individuals from migratory populations migrate north in the spring abandoning the non-migrant populations in central Mexico.
During spring migration, males reach southern Arizona in late February or early March, northern Arizona in early April, Colorado in late April to late May, Wyoming in mid-May, and the northern limits of their range in Idaho/Southern Montana by late May.
After breeding, Broad-tailed Hummingbirds start their south-bound migration into their winter range in Mexico, arriving there by August. Males arrive before females and juveniles, occupying the best quality territories.
Resident of rugged mountain terrain with cliffs, canyons, and rushing streams. Also, open woodland, especially pinyon-juniper and pine-oak association, brushy slopes, and riparian and montane scrub and thickets.
In their winter range, which overlaps with the breeding range of resident populations in Mexico, Broad-tailed Hummingbirds use thorn and oak forests at lower elevations, and mixed oak-pine and cypress as well as fir forests at higher elevations.
Male Broad-tailed Hummingbirds returning from migration ahead of the females seek out territories with nectar-rich flowers where they may establish a territory of a quarter acre or more. Territory size will ultimately depend upon food availability as well as density of birds.
You will often see males defending a food supply from other hummers. They have favorite perches, usually on a high branch near a flowering bush or feeder. This elevated position gives them an excellent vantage point to watch over their territory.
Males will not hesitate to descend aggressively upon almost any intruder in their territory including larger birds, cats, squirrels, human beings, butterflies, moths, bees, wasps, and/or yellow jackets. When an intruder is spotted, they will fly directly at them, chasing the trespasser out of its territory.
During courtship, male Broad-tailed hummingbirds fly before the female in a U-shaped pattern, diving from 30'-50'. The dive produces a loud wing buzz. Both birds may ascend to 90', one 4'-5' below the other, before descending together.
Males court females for a short time, mate, and then resume their quest for other females. The male's contribution to the breeding cycle is solely his genes, taking no part in nest building, incubation, or rearing of young. Throughout the breeding season, males will essentially spend all of their energy attempting to attract females.
Broad-tailed Hummingbirds are one of the highest altitude nesters, over 10,000 feet.
Females show strong breeding site fidelity, nesting in the same location, especially if previously successful. Accounts mention use of nests in the same tree or bush year after year. It will return to the same branch and even build a new nest atop an old one.
The nest is usually on a horizontal limb, occasionally in herbaceous plants, often over or near a stream. Nests are from as low as 3' to as high as 30'. Inner diameter is ~0.7" (1.9 cm).
The nest is composed of lichen, leaves, shredded bark, plant fibers, lined with plant down from the undersides of leaves or spider's silk.
Females spend 78% of their day on the nest during incubation and 62% of their day on the nest during brooding.
Young are altricial* and dark-skinned and are tended by the female alone. Ten to twelve days after hatching, females start to roost away from the nest, where there is almost not enough space for the young to huddle together.
*Altricial young are hatched with eyes closed, have little or no down, are unable to leave the nest, and depend on the parents for food.
Brooding periods vary with weather. Where there is abundant food and the weather is milder, the young may grow faster and leave the nest earlier.
Nestlings are fed from 1 to 3 times every hour. They are fed by regurgitation, usually while the female is hovering. The mother inserts her bill into the nestling's throat and pumps in nectar & insects.
Young broad-tailed hummingbirds will begin exercising & strengthening their wings by rapidly beating them while still in the nest. Preparing for their first flight, they will practice, but with caution. They will hold on to the rim of their tiny nest-cup with their feet to prevent themselves from being swept upwards before they are ready for it.
When they are ready to leave, the fledglings often choose the morning hours for their first flights, which are sometimes over 50 feet. They are usually quite adept at flying almost immediately, although landing takes more practice.
Broad-tailed hummingbirds feed on floral nectar and small insects, spiders, and occasionally tree sap from woodpecker (sapsucker) drillings.
Insects are caught in air as well as by gleaning from foliage.
Learn more about a hummingbird's diet.
Call a sharp, high, metallic chip often given in a short series; similar to Rufous but slightly higher. Chase call tiputi tiputi...like Rufous but lower, variable.
In forward flight, characteristic shrill, buzzing whistle made by air rushing through slots created by tapered tips of male's outer wing feathers, especially important in maintaining courtship territories.
The male dive display also produces a loud wing buzz.
Sounds of Broad-tailed Hummingbird: Call notes and wing trills made by the male.
They have rather long, bladelike wings that, unlike the wings of other birds, articulate (connect) to the body only from the shoulder joint. It is at this joint that the wing rotates almost 180 degrees to enable the bird to fly in its distinctive way.
Other birds can generate power only on the downstroke, but hummingbirds can move freely in any direction. Their wing architecture permits hummingbirds to fly not only forward but also straight up and down, sideways, and backwards and to hover in front of flowers as they obtain nectar and insectsDuring hovering, Broad-tailed hummingbird wings beat an average speed of 40-50x/sec.
Longevity Record: 12 Years and 2 months (according to USGS Bird Banding Lab).
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