Barry Mansell / Alabama waterdog (Necturus alabamensis) captive, endemic to Alabama. Endangered species.

Barry Mansell / Alabama waterdog (Necturus alabamensis) captive, endemic to Alabama. Endangered species.

John Cancalosi / Mud puppy (Necturus maculosus) New York, USA

John Cancalosi / Mud puppy (Necturus maculosus) New York, USA

Pete Oxford / Common mudpuppy (Necturus maculosus) underwater. Hiwassee River, Cherokee National Forest, Tennessee, USA, July.

Barry Mansell / Alabama waterdog (Necturus alabamensis) Black Creek, West Florida, USA, March

Barry Mansell / Black warrior waterdog (Necturus alabamensis) spotted phase larval form, Sipsey Fork, Winston County, Alabama, USA

Daniel Heuclin / Common mudpuppy (Necturus maculosus maculosus) from USA and Canada

Barry Mansell / Dwarf waterdog (Necturus punctatus) underwater, captive, Central Georgia, USA, May

Barry Mansell / Dwarf waterdog (Necturus punctatus) underwater, captive, Central Georgia, USA, May

Barry Mansell / Alabama waterdog (Necturus mounti) Florida, USA

Barry Mansell / Alabama waterdog {Necturus alabamensis} Alabama, USA