You cant have a definet answer it depends on the bird
Te specific study of the birds nest is calle "ornithology".
they get twigs, small branches, etc. then put it together.
everything from feathers, to twigs, to paper... anything. Amanda Steffey
ITS A hairy bunch of birds' nest, twigs, dirt, frog
they sleep in big bushy nest made of leaves, branches, mud and twigs
Well a Sugar glider can live in many different habitats and environments. The ones that I know of is a little nest that the build in/on a tree. If the Sugar glider's nest is in the tree.... there will be a big hole in a tree branch with multiple twigs and leaves. Though if this adorable animal is living on the tree it is almost like a bird nest but, there are a bunch of leaves. These creatures use twigs for the structure and make the rest with leaves. Unlike, a Sugar glider's nest some birds use mud and when I've seen multiple bird nests they use more twigs than leaves.
worms and twigs of its nest
twigs
Birds do gather twigs, leaves, and straw to create their shelters, nests.
Weaver birds use a variety of plant materials to build their nests, including strips of grass, leaves, twigs and roots.
Mud and sticks weaved in and out. They use feathers,sticks,leaves,peices of fabric and comfterble things to make the nest.
however many the bird decides to put in the nest.