Many ruby-throated hummingbirds migrate as far as 800 km each way. In the fall, they fly south to Mexico and Central America. In the spring, they fly north to their breeding grounds. Ruby-throated hummingbirds migrate in the spring and fall. This helps these hummingbirds survive in cold weather. Torpor is similar to hibernation the hummingbird’s heart and other organs slow down and the body cools down while the hummingbird sleeps. In very cold weather, ruby-throated hummingbirds save energy by entering torpor. If the intruder doesn’t leave, the male will chase him away.
If a male hummingbird’s territory is invaded, he will call at the intruder. Males of this species are territorial, and they defend their territories mostly using calls. Status: wild 109 months Bird Banding Laboratory Males often do not live as long as females because they have to spend so much energy defending a territory during the breeding season, and then they have to migrate to their wintering grounds, which also uses a lot of energy. The oldest wild ruby-throated hummingbird female lived at least 9 years. The male does not provide any parental care. She builds the nest, lays the eggs, incubates them, broods the chicks and feeds them until they are 22 to 25 days old. After the male and female copulate, the female raises the chicks alone. Male ruby-throated hummingbirds do not help to raise their chicks. Average age at sexual or reproductive maturity (male) 1 years.Average age at sexual or reproductive maturity (female) 1 years.Breeding season Ruby-throated hummingbirds breed between March and July, with mid-May being the height of the breeding season.How often does reproduction occur? Ruby-throated hummingbirds can raise up to three broods each year.gonochoric/gonochoristic/dioecious (sexes separate).Ruby-throated hummingbirds can raise up to three broods each year. These birds probably breed the next year when they are 1 year old. The female keeps feeding them until they are 22 to 25 days old. The chicks leave the nest when they are 18 to 22 days old. The chicks are helpless when they hatch, and must be kept warm by the female. She incubates the eggs for 10 to 14 days. When the nest is finished, the female lays 2 eggs. The outside of the nest is decorated with lichens. The nests are made of plant material, spider webs, bud scales and pine resin. Females usually chose a spot that is above an open area and shaded by leaves. She builds the nest near the tip of a branch. The female chooses a nest site and builds a nest. The male searches for another female to copulate with and the female builds the nest and raises the chicks alone. After a male and female copulate, they do not stay together. If the female is receptive to the male, she may give a “mew” call and assume a solicitous posture with her tail feather cocked and her wings drooped. During this display, the male's wings can beat up to 200 times per second. If the female perches, the male starts flying back and forth in front of her very quickly. He may also perform a “dive display” by diving over and over above the females head. When a female enters a male’s territory, the male fluffs out his red-throat feathers and begins harassing the female. When the females return, males try to attract them by performing courtship displays.
Males return to the breeding area in the spring and find a territory before the females arrive. It is also possible the each female mates with many males. However, mating behavior has not been studied very well in this species. Ruby-throated hummingbirds are probably polygynous (one male mates with many females).
Average basal metabolic rate 0.07832 W AnAge.Young ruby-throated hummingbirds look like adult females. Females have a dull grayish throat, and a square, white-tipped tail. Males have a bright red shiny throat and a forked tail. Males and females have and iridescent green back and head and a white belly.
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