Baby Hummingbirds In The Nest

As far as is known, male hummingbirds do not take part in nesting. Most species build a cup-shaped nest on the branch of a tree or shrub, though a few tropical species normally attach their nests to leaves. The nest varies in size relative to species, from smaller than half a walnut shell to several centimeters in diameter. In many hummingbird species, spider silk is used to bind the nest material together and secure the structure to its support. The unique properties of silk allow the nest to expand with the growing young. Two white eggs are laid, which, despite being the smallest of all bird eggs, are in fact large relative to the hummingbird's adult size. Incubation lasts 14 to 23 days, depending on species, ambient temperature, and female attentiveness to the nest. The mother feeds her nestlings on small arthropods and nectar by inserting her bill into the open mouth of a nestling and regurgitating the food into its crop.
Sonation during display dives
The outer tail-feathers of male Anna's Hummingbird (Calypte anna) vibrate during display dives and produce a loud chirp. When courting, the male ascends some 30m before diving over an interested female at high speed and producing a high-pitched sound. Experiments showed that the birds could not make the sound when missing their outer tail-feathers, and that those same feathers could produce the dive-sound in a wind tunnel. The bird can sing at the same frequency as the tail-feather chirp, but its weak syrinx is not capable of the same volume. Many other species of hummingbirds also produce sounds with their wings or tail, including the wings of the Broad-tailed Hummingbird, Rufous Hummingbird, Allen's Hummingbird, Streamertail, as well as the tail of the Costa's Hummingbird and the Black-chinned Hummingbird.