One, an egg tooth is a hardened point on thr tip of the undeveloped short bill. The other is a big hatching muscle on the back of its head which gives greater force to the egg tooth in pecking out of the shell. Once hatched these features disappear. Any broken shells are disposed of by the mother. The stouthearted moms fearlessly protect their nests.
Hummingbirds can catch insect on the wing.
They hover behind and below their prey, then snatch it out of the air by darting forward and upward. Hummingbirds sing with their hands. It is the humming of their wings that gives them their name. Hummers can preform extraordinary aerobatics because of their unique anatomy. Most hummerbird bones are porous, but some, like their wing and leg bones, are hollow.