An ensatina salamander, ('Ensatina eschscholtzii eschscholtzii').
Photograph by Joël Sartore, National Geographic Photo Ark
A pink-sided treefrog ('Agalychnis litodryas') at the Catholic University of Ecuador.
Photograph by Joël Sartore, National Geographic Photo Ark
A blue-tailed fire-bellied newt, ('Cynops cyanurus').
Photograph by Joël Sartore, National Geographic Photo Ark
Budgett's Frog ('Lepidobatrachus laevis') at the National Aquarium in Baltimore.
Photograph by Joël Sartore, National Geographic Photo Ark
A northern banana salamander, ('Bolitoglossa rufescens').
Photograph by Joël Sartore, National Geographic Photo Ark
A male white-spotted glass frog ('Sachatamia albomaculata') at the Atlanta Zoo.
Photograph by Joël Sartore, National Geographic Photo Ark
Blotched or banded tiger salamanders ('Ambystoma tigrinum melanostictum') at the National Mississippi River Museum and Aquarium.
Photograph by Joël Sartore, National Geographic Photo Ark
A Malaysian horned leaf frog, ('Megophrys nasuta').
Photograph by Joël Sartore, National Geographic Photo Ark
A slimy salamander ('Plethodon glutinosus glutinosus') at Toledo Zoo.
Photograph by Joël Sartore, National Geographic Photo Ark
A Malaysian golden gliding frog, ('Polypedates leucomystax').
Photograph by Joël Sartore, National Geographic Photo Ark
A redback salamander ('Plethodon cinereus') at the National Mississippi River Museum and Aquarium.
Photograph by Joël Sartore, National Geographic Photo Ark
A great plains toad ('Anaxyrus cognatus') at the Phoenix City Zoo.
Photograph by Joël Sartore, National Geographic Photo Ark
A rough-skinned newt ('Taricha granulosa') at Oregon Zoo.
Photograph by Joël Sartore, National Geographic Photo Ark
A pair of evergreen toads (Incilius coniferus or Bufo coniferus) at Atlanta Zoo.
Photograph by Joël Sartore, National Geographic Photo Ark
An axolotl (Ambystoma mexicanum) at the Detroit Zoo.
Photograph by Joël Sartore, National Geographic Photo Ark
An oriental fire bellied toad (Bombina orientalis) at Denver Zoo.
Photograph by Joël Sartore, National Geographic Photo Ark
A leopard-bellied scrub toad (Ollotis signifera) at Atlanta zoo.
Photograph by Joël Sartore, National Geographic Photo Ark
A marbled newt (Triturus marmoratus) at Conservation Fisheries.
Photograph by Joël Sartore, National Geographic Photo Ark
Juvenile Stolzmann's horned frogs, (Ceratophrys stolzmanni).
Photograph by Joël Sartore, National Geographic Photo Ark
Metamorphosis of a roque treefrog, (Hyloscirtus phyllognathus).
Photograph by Joël Sartore, National Geographic Photo Ark
A rare pebas stubfoot toad (Atelopus spumarius) at the Catholic University of Ecuador.
Photograph by Joël Sartore, National Geographic Photo Ark
A near threatened albino streamside salamander (Ambystoma barbouri) at Cincinnati Zoo.
Photograph by Joël Sartore, National Geographic Photo Ark
A Madagascar reed frog (Heterixalus madagascariensis) at the Plzen Zoo.
Photograph by Joël Sartore, National Geographic Photo Ark