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Free nature apps 

Find these apps and more in the Apple App Store or Google Play:
  • iNaturalist.
  • Leafsnap.
  • TreeBook.
  • VTree.
  • What Knot to Do.
  • Ready Jet Go.
  • NATURE CAT.
  • AllTrails.
  • Geocaching.
  • Audubon Bird Guide.
  • Audubon Owls Guide.
  • Larkwire (bird songs/sounds).