On 11th September 1990, a team directed by J. Serra-Cobo rediscovered the Pyrenean Frog. Since then, different studies have shown the singularity of the Pyrenean Frog and especially its reproductive behaviour. The talk will give information on the reproductive behaviour of the Pyrenean Frog, the state of conservation of the species and will analyse the main factors that have a negative effect on its population.