closeup on a mating pair of the endangered aquatic japanese riu-kiu sword-tailed newt, cynops ensicauda in an aquarium

amphibia amphibian chordata asian caudata cynops ensicauda japan ecology japanese endangered riu kiu newt salamandridae sword urodela tailed animal aquatic beautiful biology endemic bright closeup firebelly firebellied herpetology macro natural freshwater orange pet red salamander single swordtailed threatened underwater vertebrate wild wildlife zoology riukiu aquarium