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Nature ID Guides: Trees, Tracks, Scat and Shells

Each guide here starts with the one feature that decides the answer — the way leaves sit on a twig, the number of a spider's eyes, whether a track shows claw marks — and then works outward to the details that confirm it. Facts come from university extension services, state wildlife agencies, the National Park Service, NOAA and the CDC, with sources listed on every page. Where a plant is toxic or an animal sign carries a health risk, the guide says what to do rather than what to risk. Photograph the thing in front of you and the app identifies it; these pages are how you check the answer.