The Pyrenean brook salamander sometimes aestivates in hot weather in the lower parts of its range.

Some Pyrenean brook salamanders live entirely inside caves where they breed over a long period of the year due to lack of day length stimulus.

The Pyrenean brook salamander is infrequently seen, though it is active by day, as well as by night.

Pyrenean brook salamander (Euproctus asper)

Among the amphibians, Pyrenean Brook Salamander "Euproctus asper" is significant but not easy to spot.

The Pyrenean Desman is found only in some of the streams of the northern slopes of these mountains, Pyrenean Brook Salamander also lives in streams and lakes located at high altitudes.

Pyrenean brook newt (Calotriton asper)