රන ලදී. සම්ප්‍රවේශය 9 June 2008.↑ 64.0 64.1 Lockwood, pp. 6–9↑ 65.0 65.1 65.2 65.3 Stirling, Ian (1988). "The Original Polar Bear Watchers". Polar Bears. Ann Arbor: University of Michigan Press. ISBN 0-472-10100-5.↑ 66.0 66.1 66.2 66.3 66.4 66.5 66.6 66.7 66.8 Uspensky, Savva Mikhailovich (1977). Белый Медведь (tr: Belyi Medved') — (in Russian). Moscow: Nauka.↑ As a carnivore which feeds largely upon fish-eating carnivores, the polar bear ingests large amounts of vitamin A, which is stored in their livers. The resulting high concentrations cause Hypervitaminosis A, Rodahl, K.; Moore, T. (1943). "The vitamin A content and toxicity of bear and seal liver". The Biochemical Journal. 37 (2): 166–168. PMC 1257872. PMID 16747610.↑ 68.0 68.1 Lockwood, pp. 31–36↑ "Polar Bear Management". Government of the Northwest Territories. 4 May 2008 දින මුල් පිටපත වෙතින් සංරක්ෂණය කරන ලදී. සම්ප්‍රවේශය 14 March 2008.↑ "Release of the 2006 IUCN Red List of Threatened Species reveals ongoing dec