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
Killdeer are birds that make their nest on the ground, usually on gravel. When the young are born the are ready to run.
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.
Yes, some bird species do reuse old nests, while others build new nests each breeding season.
A cuckoo burrow is a narrow tunnel or chamber in the ground where a cuckoo bird lays its eggs. The cuckoo does not build its own nest but instead lays its eggs in the nests of other bird species, tricking them into incubating and raising its young.
The larger the bird, the larger its nest.
Yes, some bird species reuse their nests, while others build new ones each breeding season.
No, they can fly. The peafowl nests and feeds on the ground, but roosts in low trees.