The tiger is part of the kingdom Animalia, phylum Chordata, class Carnivora, family Felidae, subfamily Panthernae, genus/species Panthera tigris. Tigers have round pupils and yellow irises (except for the blue eyes of white tigers). 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. …showed first 75 words of 1968 total…

…showed last 75 words of 1968 total…Jersey. Karanth, K. U. 1991. How many tigers can there be? In: Great Cats: Majestic Creatures of the Wild. pp. 105. J. Seidensticker and S. Lumpkin, eds., Rodale Press, Emmaus, PA. Linden, E. 1994. Tigers on the Brink. Time. 143(13):44-51. Mithapoula, S. 1991. Tiger subspecies. In: Great Cats, Majestic Creatures of the Wild., J. Seidensticker and S. Lumpkin, Eds., Rodale Press, Emmanus, p. 100. Thapar, V. 1992. The Tiger's Destiny. Kyle Cathie, London. 176 pp. Tiger Information Center, http://www.5tigers.org