For amateur naturalists
MyNature Animal Tracks helps you identify animal tracks and scat by having you work through a series of illustrations and simple questions. It also provides audio files of animal calls.
iBird is a bird identification app that’s part of a whole suite. Beginners can use a starter version to identify backyard species, while serious birders will choose iBird Pro. Pro has detailed descriptions of nearly 1,000 bird species.
MyNature Tree Guide has more than 190 tree species in its database. You can search by leaf, and there’s a ruler function for measuring leaves or petals when needed.
iNaturalist is a plant and animal identification app that’s also a social network for naturalists. Connect with scientists and help them track things that are happening in your region by recording your plant and animal findings into the database.