A worldwide community photographing and learning about wildlife
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Here are some missions you might consider:
Amphibians of the World
http://www.projectnoah.org/missions/8001...
Mimetic Animals of the World
http://www.projectnoah.org/missions/8015...
The gray treefrog and the Cope's gray treefrog are nearly identical, but the author of Oklahoma's amphibian and reptile field guide states: "The author has noticed that the gray treefrog cannot become completely green on the back. It will always have black and/or gray lines showing."