Blue tits
The ostrich and emu, both flightless birds. :-)
Yes. Emus are flightless birds, so they live their entire lives on the ground.
birds and bats
no not all birds
creatures that live above the ground. der
Some birds live in a burrow in the ground; others live in a hollow in a tree trunk.
So they can survive from their predators, who live on ground.
Birds live anywhere in the world, even in Antarctica. They live in trees, on the ground, in forests, and in deserts. Birds can live anywhere and can even be kept as pets. Most birds migrate to warmer areas when the weather starts to get chilly. To answer your question short, birds can live anywhere.
They live under ground because its better to wiggle around and so they don't get eaten by birds,dogs,foxes, or even people 
Nests are simply used as nurseries. Birds do not stay in a nest once the babies are old enough to live on their own. Birds live in trees and bushes. Females only stay in a nest if there are eggs or little ones.
Kakapos are forest birds. They are ground dwelling and live in New Zeland.
Some common birds that live in grassland regions include meadowlarks, pipits, ground-nesting birds like plovers, and birds of prey such as hawks and owls. These birds are adapted to the open grassy habitats and often feed on insects, seeds, or small mammals found in the grasslands.