Joel Sartore / Photo Ark / Mexican narrow-mouthed toad (Hypopachus variolosus) portrait, Natura Eco Park, Costa Rica. Captive.

Joel Sartore / Photo Ark / Mexican narrow-mouthed toad (Hypopachus variolosus) portrait, Natura Eco Park, Costa Rica. Captive.

Bruce Thomson / Fry's frog (Austrochaperina fryi) on wet rocks and leaf litter, portrait, Mount Lewis National Park, Wet Tropics World Heritage area, Queensland, Australia.

Chris Mattison / Fry's frog (Austrochaperina fryi) sitting on fallen leaves, Possum Valley, Queensland, Australia

Chris Mattison / Ornate nursery frog (Cophixalus ornatus) sitting on lily pad, Possum Valley, Queensland, Australia