if you stand at the edge of the big woods after dark and listen, you would hear many strange sounds. not everything goes to sleep after the sun goes down! many animals live most of their busy lives in the hours of darkness. at night flying squirrels wake up, bats and owls flutter and fly about, at various times katydids, tree toads, and peepers are heard, whippoorwills whistle, beavers swim out of their houses, field mice wait and listen. while we sleep, all these and many more animals are abroad, searching for food, building their homes, and doing all the things which other animals do by day. visit the fascinating world these animals live in and find out what causes some of the far-off eerie sounds of the night. another glenn blough book of simple science which opens our eyes to the world around us.