closeup on the thorn on back of the body of the rare yellow spotted caucasian salamander, mertensiella caucasica

amphibia amphibian chordata caucasian salamander caudata mertensiella caucasica nature salamandridae urodela animal biology closeup herpetology macro newt outdoors predator single streamdwelling tailed vertebrate wild wildlife zoology detailed rare stream dwelling yellow spotted endangered ecology male status green moss thorn