The upper lip is often noticeably pale and the throat and underparts are whitish with the belly sometimes flushed with yellow or pink, especially under the thighs.

It is found in and around fast-moving, rocky streams with little vegetation, sharing this habitat with the Pyrenean brook salamander (Calotriton asper).

[3] Adult Pyrenean frogs spend much of their time in the fast-flowing rocky streams and torrents near which they live, but juveniles are more terrestrial.

Breeding takes place after the snow has melted, the female laying batches of jelly-covered eggs (totalling up to 150) under stones, in crevices or on the bed of a stream.

[1] Threats it faces include alteration to its habitat through the intensification of agricultural practices, disturbance from increased tourism, the introduction of non-native fish and possibly climate change.