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1 A Colorado Desert Sidewinder hunkered down in the sand -
1 A Mojave Desert Sidewinder on a road at night -
1 Sonoran Desert Sidewinder on a warm road at night -
2 A Banded Rock Rattlesnake perched on a small branch a foot or so above the ground -
1 An Arizona Black Rattlesnake in a defensive posture -
1 A beautiful Black-tailed Rattlesnake coiled against a tree trunk in the Huachuca Mountains, Arizona -
2 A Tiger Rattlesnake blending in with its surrounding rocks near Tucson, Arizona -
4 A coiled and unhappy Ridge-nosed Rattlesnake -
6 A neonate Twin-spotted Rattlesnake (Crotalus pricei) basking in the morning sun -
4 A Helmeted Basilisk clinging to a vertical branch in Golfito, Costa Rica -
2 A Smoky Jungle Frog (Leptodactylus pentadactylus) lurking in the grass in Peruvian Amazonia -
1 A South American toad (Rhinella "margaritifera") hiding in the leaf litter in Peruvian Amazonia -
6 A Rough-skinned Green Treefrog (Hypsiboas cinerascens) stares philosophically into the distance -
3 Three-striped Poison Frog (Ameerega trivittata/trivittatus) with hitchhiker in Peruvian Amazonia -
5 A Rocket Treefrog (Hypsiboas lanciformis) prepares to leap away in the Amazon basin near Iquitos, Peru -
3 A Convict Treefrog (Hypsiboas calcaratus) showing off its prisoner stripes. -
12 An Emerald Tree Boa (Corallus batesii) coiled on a thin branch in the Amazon basin in Peru -
4 Close-up of a Yellow-tailed Indigo Snake (Drymarchon corais) from the Amazon basin in Peru -
2 A South American Fer-de-Lance (Bothrops atrox) on the forest floor in the Amazon basin in Peru -
1 An Emerald Tree Boa (Corallus batesii) coiled high above in the Amazon basin in Peru -
1 An Ornate Snail-eating Snake (Dipsas catesbyi) resting in foliage in the Amazon basin in Peru -
6 A Yellow-flecked Glass Frog (Sachatamia albomaculata) on a boulder in El Valle de Anton, Panama -
3 A Rosenberg's Gladiator Tree Frog perched on a thin tree in Gamboa, Panama -
17 A tiny Amazon Dart Frog (Ranitomeya amazonica) perched on a leaf in Iquitos, Peru