Population size and structure of the common frog, Rana temporaria, have been intensively studied by many authors during the last three decades (e.g. Cooke, 1975; Grossenbacher, 1980; Pascual andMontori, 1981; Hintermann,1984;Loman, 1984;Ryser, 1986;Elmberg, 1990; Kneitz, 1998). Most of these papers deal with low- or mid-altitude populations in Central Europe, which are generally located in at least partly forested habitats,whereas few studies have been carried out on the ecology of Rana temporaria in alpine environments (e.g., Balcells, 1975; Elmberg and Lundberg, 1991; Ryser, 1996).

The aim of this study was to provide a contribution to the knowledge of ontogenic pattern variation in a montane common frog population.

Lacerta bonali is a montane lizard endemic to the central western part of the Pyrenean mountain chain. Here we report on the observation of L. bonali at 3000m of altitude, constituting the highest known altitude record for the species.The exact site was situated a few meters below the highest point of the summit of the Grande Facha Mountain 3005m a.s.l.