Heidi & Hans-Juergen Koch / African Clawed Frog (Xenopus laevis), native to Africa

Piotr Naskrecki / Surinam Toad (Pipa pipa) mimicking leaf litter in pond, Guyana

Pete Oxford / African Clawed Frog (Xenopus laevis) albino, southern Africa

Pete Oxford / African Clawed Frog (Xenopus laevis) albino floating in water, native to southern Africa

Pete Oxford / African Clawed Frog (Xenopus laevis) albino floating near water surface, native to southern Africa

Piotr Naskrecki / Western Clawed Frog (Silurana tropicalis) tadpoles, Atewa Range, Ghana

Piotr Naskrecki / Surinam Toad (Pipa pipa) mimicking leaf litter in pond, Guyana

Piotr Naskrecki / Surinam Toad (Pipa pipa) mimicking leaf litter in pond, Guyana

Piotr Naskrecki / African Clawed Frog (Xenopus laevis) aquatic frog species rarely seen out of water, Guinea, West Africa

Ingo Arndt / African Clawed Frog (Xenopus laevis) detail of webbed foot

Ingo Arndt / African Clawed Frog (Xenopus laevis) detail of webbed foot

Ingo Arndt / Surinam Toad (Pipa pipa) detail of webbed foot

Heidi & Hans-Juergen Koch / African Clawed Frog (Xenopus laevis) swimming underwater showing underside and front feet, aquatic, rarely seen out of water, native to Africa

Heidi & Hans-Juergen Koch / African Clawed Frog (Xenopus laevis) pair underwater, resting on bottom, aquatic, rarely seen out of water, native to Africa

Heidi & Hans-Juergen Koch / African Clawed Frog (Xenopus laevis) tadpoles, aquatic frog species rarely seen out of water, native to Africa

Heidi & Hans-Juergen Koch / African Clawed Frog (Xenopus laevis) tadpoles, aquatic frog species rarely seen out of water, native to Africa

Heidi & Hans-Juergen Koch / Surinam Toad (Pipa pipa) aquatic toad swimming underwater showing underside, has extremely flat body, native to South America

Pete Oxford / African Clawed Frog (Xenopus laevis) albino, southern Africa

Pete Oxford / African Clawed Frog (Xenopus laevis) albino floating in water, southern Africa