But they are active catching their prey during the daytime. Then there are the little cuckoo, Gray's grasshopper warbler, and White's ground thrush, whose chirping can be heard at night. It is difficult to believe such birds are busy catching prey at night. It is thought that only their chirping and related actions are conducted at night. Some feel that these birds make the most of the night, after catching their prey during the day where it is easier to see.
Some birds adjust themselves to special environments.
In the cities where there is enough light, you can see swallows catching prey around streetlamps and rock pigeons picking up food off of railway platforms. It is also said that birds do not need to sleep several hours at a stretch. They only need several catnaps a day to stay refreshed. It is known that the birds of the Arctic Circle sleep very little in summer, when it's daytime round the clock. The mating locations are called colonial nests.