They rip hair off and coat the nest with it. Then they will give birth. Sometimes, though, they have a false pregnancy when they are close to male hormones and pretend they are pregnant. Within a week of building the nest they will usually give birth if they are, in fact, pregnant.
A Cukoo Bird builds it's nest in a chimney
nest
The Weaver builds a nest out of grasses, with the entrance at the bottom.
The King Cobra is the only snake that builds its own nest as well guards the nest too.
an eagle builds a nest called an aerie
A peacock builds a nest out of branches.
if you like bird feces
Kingfisher builds its nest in banks near the water.
termite
the female
skylark
nothing :)