What happens in just a second? A bat makes 200 high-pitched calls. A hummingbird beats its wings 50 times. A woodpecker hammers a tree trunk with its beak 20 times. A human can blink 7 times. A vulture in fight flaps its wings once. This nonfiction picture book explores the concept of time as a series of events in the natural world that take place in given units of time.