Tigers can see in the dark six times better than humans can. Tiger hair length varies geographically. The density of fur is dependent on seasonal and geographical factors. The Sumatran tiger has approximately 1,700 to 2,000 hairs per square centimeters while the winter coat of the Siberian tiger has as many as 3,000 to 3,300 hairs per square centimeter. A tiger's forefeet have five toes and the hind feet have four toes.
All toes have claws.
The claws are 80 to 100 mm in length. Chromosomes are arranged in pairs and there are 19 pairs in a tiger, or 38 chromosomes altogether.