Frogs that spawn in water appear to sit on their nest while they are laying their eggs. Frogs that spawn in damp leaf litter may sit on the clutch to protect them.
to keep the egg and the chick inside warm :D
Not sit, but the bird will keep the eggs protected until they hatch.
To keep them at a constant temperature.
It is a bird. A bird hatches from an egg.
Emperor Penguin The Emperor Penguin
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.
The mother hatches an egg The mother lays the eggs, sits on them to keep them warm while incubating, then feeds them when they hatch out.
It either hatches and a baby bird comes out, or the egg rots.
Until the egg hatches.
Well that depends on the bird. Some birds' egg's takew about 1-2 weeks while others take 28 days.
The egg yolk nourishes the chick until it hatches.
I think the word you are looking for is - an egg!
wait until it hatches. then you will know
to keep the egg warm, and to protect it.
incubator