Some birds that build their nests on the ground are flightless birds, such as emus and ostriches, but other birds which can fly are also ground-nesting. These birds include chickens, penguins, killdeer (a kind of plover), and water birds such as ducks, geese, swans etc.
Raccoons will take advantage of a hollow tree to use as a den. However, they do not build 'nests' in trees such as a bird would build. They do climb trees for protection, however. They more frequently build a den at or near ground level.
Hedge sparrows are properly called dunnocks and they are not actually sparrows at all. They build their nests in dense shrubbery and hedgerows (see Sources and related links, below).
Birds build nests to protect their eggs.
penguins don't build nests
A hoopoe flies. It's a bird and it isn't flightless. Although, they do prefer to stay lower to the ground. They don't build their nests too high in the trees.
They are a type of game bird that nests on the ground. A variety of pheasant I believe.
Mocking birds do not build nests. They lay their eggs in other bird's nests.
The larger the bird, the larger its nest.
No, they can fly. The peafowl nests and feeds on the ground, but roosts in low trees.
The Kiwi is a flightless bird, and must stay on the ground.
Bird nests are built mostly in spring or summer.
The Weaver Birds are a social breed. They build large nests and allow other species to settle down. Their nests hold up to 100 birds.