During the harsh, cold winter months in the Pyrenees, the Aran rock lizard hibernates, and is only active for four months of the year, from mid-May to late September or the beginning of October. This leaves little time for the lizard to reproduce, and as a result only one clutch of eggs is produced each year. An average of three to four eggs are laid and incubated for a period of 30 to 36 days. The young Aran rock lizards develop slowly, and sexual maturity is reached relatively late, at the age of four years in males and between four and five years in females (3).
Like the closely related Pyrenean rock lizard, (Iberolacerta bonnali), the Aran rock lizard may reduce its activity in the middle of the day during its active months, perhaps to avoid the strong ultraviolet radiation that is present at such high altitudes (2)