Tadpoles of the Andean toad Bufo spinulosus were found in warm water of a thermal spring in central Peru (Banos, 3460 m elev., Departamento Hmlnuco, Provincia Dos de Mayo). Adjacent water bodies of similar size but without connections to the thermal spring did not contain tadpoles. Water temperatures of the thermal and non-thermal water were measured and compared. 33,4 °C was the highest water temperature where a tadpole of Bufo spinulosus was observed.