Why do some plants only blossom during the day? How do certain birds know when and where to migrate? Why are some people "early birds" and others "night owls"? A noted science writer explains the workings of human and animal biological clocks. Includes 30 illustrations by famed author/illustrator Jan Brett. "A fascinating subject, well handled." -- "School Library Journal."Why do some plants only blossom during the day? How do certain birds know when and where to migrate? Why are some people "early birds" and others "night owls"? A noted science writer explains the workings of human and animal biological clocks. Includes 30 illustrations by famed author/illustrator Jan Brett. "A fascinating subject, well handled." -- "School Library Journal."
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