The Polar Bear (Ursus Maritimus) Is A Bear Native To The Arctic Ocean And Its Surrounding Seas. The World's Largest Predator Found On Land, An Adult Male Weighs Around 300–600 Kg (660–1,300 Lb), While An Adult Female Is About Half That Size.The IUCN Now Lists Global Warming As The Most Significant Threat To The Polar Bear, Primarily Because The Melting Of Its Sea Ice Habitat Reduces Its Ability To Find Sufficient Food. The IUCN States, If Climatic Trends Continue Polar Bears May Become Extirpated From Most Of Their Range Within 100 Years.On May 14, 2008, The United States Department Of The Interior Listed The Polar Bear As A Threatened Species Under The Endangered Species Act. Photo