The Hawk-Moths were awake more or less during the day, but it was not until the sun was low in the western sky that they were busiest. When every tree had a shadow two or three times as long as the tree itself, then one heard the whir-r-r of wings and the Hawk-Moths darted past. They staid up long after the daylight people went to bed. The Catbird, who sang from the tip of the topmost maple tree branch long after most of his bird friends were asleep, said that when he tucked his head under his wing the Hawk-Moths were still flying. In that way, of course, they became acquainted with the people of the night-time.