Source: https://www.researchgate.net/profile/Onesime-Prudhomme/publication/272487236_Observations_sur_la_Grenouille_des_Pyrenees_Rana_pyrenaica_en_foret_d'Iraty_Pyrenees-Atlantiques/links/54e5df580cf2bff5a4f1cb53/Observations-sur-la-Grenouille-des-Pyrenees-Rana-pyrenaica-en-foret-dIraty-Pyrenees-Atlantiques.pdf