Book 31, Question 98
Why are some birds noisy after dark?
Some birds, such as nightingales, mockingbirds, and owls, sing at night.
At night there is less noise from daytime birds and traffic, so a song can be heard farther. Bright lights from cities can also trick birds into singing. And many migrating birds call to each other as they fly overhead in the dark, using short flight calls to stay together.