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They don't. Once the egg has developed to a certain stage, the egg is laid in the nest.
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What is the reproductive advantage that a mammal has over a bird?
Since birds lay eggs, they are more likely to have their eggs eaten. Since mammals keep their fetuses inside of themselves, the baby has more of a chance of surviving.
Do whales have eggs inside of them?
Whales do have eggs inside of them. but not like birds or reptiles might. Whales are mammals and have pretty much the same kind of eggs inside them as human females.
Why do birds have to keep their eggs a certain heat?
When birds lay eggs they usually sit on them and keep them warm. Just like when a human is pregnant, our baby stays warm inside our body. If we freeze to death outside, our baby would die. If the eggs aren't kept at the temperature of the parents they wont be warm enough and they baby birds will not grow inside.
Do Kingfisher lay eggs?
Of course they lay eggs, they're birds ! did you not learn anything in Biology ?
When birds are pregnant do there babies kick from inside the egg like human babies do or can they not do that?
Birds don't have live young; they lay eggs.
How do crows lay eggs?
Crows lay eggs just like any other bird. They lay it in a nest and when its time the eggs will crack and hatchlings will come out.
Are ducks born from eggs or do they have live birth?
The fertilized egg develops after it's laid. The developing embryo grows inside the egg until it's grown enough to hatch out. The egg contains a tiny air-sac to allow the baby duck to take a breath while it fights to break the shell. The babies are alive inside the egg.
Do mallard ducks have to sit on their eggs?
All birds have to incubate their eggs, keeping them at a certain temp and turning them so the chicks won't stick to the inside of the eggs. Some birds cover their eggs to keep them warm when they are away, but most just use their own body heat
Do birds lay eggs or not?
yes birds lay eggs
What birds are not laying eggs?
All birds lay eggs.
When do hummingbirds lay eggs?
the humming birds are eggs because it is a bird All of the kind of birds is hatched from eggs
How does a bird have babies?
Male and female birds mate, and the male places sperm inside the body of the female. This fertilizes the eggs being formed inside the body of the female bird. When they are formed, the female lays the eggs in a nest, keeps them warm with her body until they hatch into baby birds.
