Waterfall climbing cave fish

A tiny loach from the Tham Maelana and Tham Susa karst of northern Thailand that walks. It climbs steep rock in fast-flowing waterfalls using the same diagonal gait as a salamander, braced by a robust pelvic girdle with features usually linked to land vertebrates. It is depigmented, has no visible eyes and grows to only about 2.8 cm. A 2016 study of how it moves drew wide attention because that pelvis echoes the anatomy of early four-legged animals. The fish is rare and protected, which has kept research on it limited.