And in Siberia, where there is little prey to be found, male tiger territories are as large as 400 square miles. Due to a retinal adaptation that reflects light back to the retina, the night vision of tigers is six times better than that of humans. Like domestic cats, tiger claws are retractable. Tiger scratches on trees serve as territorial markers. 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. No one knows exactly why tigers are striped, but scientists think that the stripes act as camouflage, and help tigers hide from their prey. The Sumatran tiger has the most stripes of all the tiger subspecies, and the Siberian tiger has the fewest stripes. The tiger's head often carries the Chinese mark of wang or king on the forehead. A tiger's tail is 3 to 4 feet long, about half as long as its body.