The biggest nests are built in Africa by social weaver birds. They have been known to pull down trees. They look like giant haystacks and average over 1000 cubic feet, housing several hundred of the birds at one time.
The bald eagle. Built of sticks, the nest can weigh up to a ton, as it may be reused year after year, with fresh sticks added for eaching nesting cycle.
BigNester
A Cukoo Bird builds it's nest in a chimney
Hummingbirds. The nest of the bee hummingbird, the smallest bird in the world, is only 3cm in diameter.
if you like bird feces
nest
cattle bird
The Weaver builds a nest out of grasses, with the entrance at the bottom.
an eagle builds a nest called an aerie
penguins don't build nests
The nests of cave swifts are used in bird's nest soup.
Swallows? Swallows?
What if? You can't really do anything, just don't mess with the eggs or nest.
egrets they are called egrets