Baby animals of any species do not mate.
Birds mate after and before making a nest
Yes, all birds mate and have nests at one point or another. The process is different with all birds.
It isn't one way for all birds, many will build a nest to attract a mate, then perform courtship rituals then lay their eggs, others will pair up and mate, then build their nest together.
they mate first then make the nests
An Aviary Where They Mate And Reproduce.
Weaver birds usually make their nest when they're looking for a mate. So in their juvenile years.
No, you need a bigger gene pool. ( they would be deformed )
The nest was built by birds.
it looks like a birds nest
No, not once they have left it.Many Birds will return to the nest they were born in, or very close, during the next season. They may bring the whole family back.
birds on the ground are in the preditors zone . so if given a choice no they wouldn't nest there. but if that's where it's at they might . but they will never feel safe there.
Te specific study of the birds nest is calle "ornithology".