Burma and Cambodia joined in 1997. Taiwan cannot be a signatory because it is not recognized as a country by the United Nations. Despite the international ban applied by Appendix 1, illegal international trade continues around the world. The life period of tigers in the wild is thought to be about 10 to 15 years. Tigers in zoos live to be between 16 and 20 years old.
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. Chromosomes are arranged in pairs and there are 19 pairs in a tiger, or 38 chromosomes altogether. One usually dies at birth.