None
It depends on the species of birds.
A bird egg is hatched by heating, or incubating it and waiting until the chick hatches. The time it takes to hatch varies from species to species.
I think the word you are looking for is - an egg!
It is a bird. A bird hatches from an egg.
A killdeer lays these eggs but they can sometimes be blue with brown spots
Yes, there is one that i know of. The Cuckoo bird lays its eggs in the nest of a host bird of another species, usually one with similar looking eggs to its own. The host bird then looks after the egg as if it were its own offspring. When the baby Cuckoo hatches, being bigger, it then pushes out the host birds real nestlings, usually making itself the sole offspring of its surrogate mother. It stays in the nest until it is ready to head out on its own and the surrogate feeds and cares for it, regardless of the fact that it has killed her young and is often much bigger in size than she is herself.
2
No, bitterns are a species of bird in the heron family. Young bats are known as pups.
not sing any songs
not sing any songs
not sing any songs
No, a whiteback is not a bird. Whiteback is a term that may refer to a specific bird species or to a physical characteristic (such as a white patch on the back of an animal), but it is not a bird species itself.