How do animals live?

Hello! I can see that you are a very kind person and love small animals very much. In fact, I think all wild animals have their own homes (nests), but different animals have their own differences. For example, some birds are smart now and don't nest in trees. In order to prevent natural enemies or heavy rain from looking for nests in small holes near human houses, there are more than two or three nests in the cracks in the tile house on the top floor of my house, and they will come back when it rains or near dusk.