A bright red sockeye salmon fights its way upriver to spawn, a colorful painted bunting signs from its perch in a tree, an American alligator lurks beneath the surface of the water, and as animals go about their lives they leave evidence of their presence. Thousands of living things inhabit North America, and each one has distinctive features that set it apart. In the North American Field Guides series, learn about hundreds of freshwater fish, reptiles, songbirds, and tracks and scat, and how to identify them in the wild.
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