polar bear. [2016-09-02]. （原始内容存档于2016-09-01）.
In ideal hunting conditions, the bear will just eat the seal fat, leaving the carcass for other animals.
http://www.defenders.org/polar-bear/basic-facts.%7C[失效連結] Behavior :
Polar bears are highly dependent on older stable pack ice in the Arctic region, where they spend much of their time on the ice hunting, mating and denning. They are generally solitary as adults, except during breeding and cub rearing.
Verena E Kutschera, Tobias Bidon, Frank Hailer, Julia L. Rodi, Steven R. Fain, Axel Janke (2014) Bears in a Forest of Gene Trees: Phylogenetic Inference Is Complicated by Incomplete lineage sorting and Gene Flow. Molecular Biology and Evolution 31(8): 2004–2017. doi:10.1093/molbev/msu186
Frank Hailer, Verena E. Kutschera, Björn M. Hallström, Denise Klassert, Steven R. Fain, Jennifer A. Leonard, Ulfur Arnason, Axel Janke (2012): Nuclear Genomic Sequences Reveal that Polar Bears Are an Old and Distinct Bear Lineage. Science Vol. 336 no. 6079: 344-347. doi:10.1126/science.1216424
Miller W, Schuster SC, Welch AJ, Ratan A, Bedoya-Reina OC, Zhao F, Kim HL, Burhans RC, Drautz DI, Wittekindt NE, Tomsho LP, Ibarra-Laclette E, Herrera-Estrella L, Peacock E, Farley S, Sage GK, Rode K, Obbard M, Montiel R, Bachmann L, Ingólfsson O, Aars J, Mailund T, Wiig O, Talbot SL, & Lindqvist C (2012). Polar and brown bear genomes reveal ancient admixture and demographic footprints of past climate change. Proceedings of the National Academy of Sciences of the United States of America, 109(36):E2382–E2390. doi:10.1073/pnas.1210506109
http://www.livescience.com/27436-polar-bear-facts.html.%7CAt[失效連結] birth, a cub weighs only 1.3 pounds (about half a kilogram), but they grow very quickly. Cubs depend on their mothers for warmth and fattening milk, which is 36 percent fat, according to the San Diego Zoo.
Wrigley, Robert E. The Oldest Living Polar Bear(PDF). Polar Bears International Newsletter. Polar Bears International. Spring 2008 [9 June 2008]. （原始内容存档(PDF)于2008-06-26）.
http://animals.sandiegozoo.org/animals/polar-bear.%7Cwhat's[永久失效連結] on the menu :The polar bear's nose is so powerful it can smell a seal on the ice 20 miles (32 kilometers) away, sniff out a seal's den that has been covered with snow, and even find a seal's air hole in the ice up to 1 mile (1.6 kilometers) away.
http://sectionhiker.com/bears_sense_of_smell.%7CBears[永久失效連結] are thought to have the best sense of smell of any animal on earth. For example, the average dog’s sense of smell is 100 times better than a humans. A blood hound’s is 300 times better. A bear’s sense of smell is 7 times better than a blood hound’s or 2,100 times better than a human.
Polar Bear-Sea Ice Relationships. [2016-08-30]. （原始内容存档于2016-06-16）. Over the past 25 years, the summer sea ice melt period has lengthened, and summer sea ice cover has declined by over half a million square miles.
polar bear. [2016-09-02]. （原始内容存档于2016-09-01）.
In ideal hunting conditions, the bear will just eat the seal fat, leaving the carcass for other animals.
Walrus. [2016-09-01]. （原始内容存档于2016-09-10）. During the 19th century and the early 20th century, walruses were widely hunted and killed for their blubber, walrus ivory, and meat. The population of walruses dropped rapidly all around the Arctic region.
Wrigley, Robert E. The Oldest Living Polar Bear(PDF). Polar Bears International Newsletter. Polar Bears International. Spring 2008 [9 June 2008]. （原始内容存档(PDF)于2008-06-26）.
Polar Bear-Sea Ice Relationships. [2016-08-30]. （原始内容存档于2016-06-16）. Over the past 25 years, the summer sea ice melt period has lengthened, and summer sea ice cover has declined by over half a million square miles.
Walrus. [2016-09-01]. （原始内容存档于2016-09-10）. During the 19th century and the early 20th century, walruses were widely hunted and killed for their blubber, walrus ivory, and meat. The population of walruses dropped rapidly all around the Arctic region.
https://www.youtube.com/watch?v=nB7gS5IcD84.%7C Published on Dec 23, 2015
Polar Bears can detect another bear with their excellent sense of smell, male bears can spend weeks tracking the scent of a female who is ready to mate. Taken from Animal Attraction. BBC earth
https://www.youtube.com/watch?v=qbdopIzESCg.%7CAfter braving three months underground a mother polar bear shows her cub the outside world for the first time. Keen photographers Andre and Anita Gilden caught the extremely rare pictures after waiting more than four days in temperatures dipping to minus 40 degrees Celsius in Manitoba, Canada.
https://www.youtube.com/watch?v=CbILj_CYqno.%7CTwo adorable newborn polar bear cubs play with their mother while they journey to the frozen sea. One cute cub climbs and hangs off mother's back. Features cubs play-fighting and nursing with mom. Very cute video! Footage copyright: Parks Canada.
Cinematographer: www.AndrewManske.com
All scenes filmed in the wilds of northern Manitoba, Canada, near Hudon's Bay.
https://www.youtube.com/watch?v=MC26JK9nk-8.%7CUnique footage of polar bear hunting bearded seal. Clip from the programme 'Polar Bear - Spy on the Ice', Produced & Directed by John Downer Productions, Narrated by David Tennant
