 Body size of different populations seems to be correlated with climate — Bergmann's rule — and can be explained by thermoregulation. Large male Siberian tigers can reach a total length of more than 3.5 m (11.5 ft) over curves and 3.3 m (10.8 ft) between pegs, and can weigh up to 306 kg (675 lb). This is considerably larger than the weight of 75 to 140 kg (165 to 309 lb) reached by the smallest living subspecies, the Sumatran tiger. At the shoulder, tigers may variously stand 0.7 to 1.22 m (2.3 to 4.0 ft) tall. The current record weight in the wild was 389 kg (858 lb) for a Bengal tiger shot in 1967.
