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I believe are called incubating birds, because they are incubating the eggs!
incubating eggs means keeping them warm ready to be hatched
Yes you can use brood as a verb to talk about birds incubating their eggs. But I think that is not common most people talk about birds sitting on eggs not brooding on eggs.
Small birds are very difficult for humans to raise after they hatch, so it is much better to let the parents do the incubating and the raising of the young.
No. Birds see color. This is a necessary adaptation for humming birds, which get their nutrition from flowers.
no,not necessary that all birds do the same...
Birds do not sleep in nests as you think, they sleep in the same places they inhabit in the daytime.+++They sleep on the nest if incubating eggs or rearing young - the only time they use nests - otherwise many of them find sheltered roosts reasonably safe from weather and predators.
Yes, all animals need to reproduce to keep from being extinct. Of course they lay eggs!
about ten at a time
Only certain birds have the gut flora necessary to eat grass. This include domestic birds such as ostriches, ducks, and geese.
Type your answer here... sternum is like a bone of wings which helps the birds to fly
Penguins are flightless birds. However, like marine mammals, they are able to swim underwater for long periods. Rather than milk, they feed their young regurgitated fish. In some species, notably the Emperor penguins, the male (who fasts while incubating the egg alone) can regurgitate a fatty substance for a newborn to eat in lieu of food.