{"id":852,"date":"2014-01-21T07:30:58","date_gmt":"2014-01-21T07:30:58","guid":{"rendered":"http:\/\/www.123fakta.com\/da\/?p=852"},"modified":"2026-03-19T10:38:47","modified_gmt":"2026-03-19T10:38:47","slug":"fakta-om-isbjorne","status":"publish","type":"post","link":"https:\/\/www.123fakta.com\/da\/facts-about-polar-bears","title":{"rendered":"Fakta om isbj\u00f8rne"},"content":{"rendered":"<ol>\n<li><strong>Sort hud:<\/strong>\u00a0Isbj\u00f8rnens pels kan variere i farve fra n\u00e6sten kridhvid til elfenben - men dens hud er helt sort, hvilket hj\u00e6lper den med at absorbere solens varme.<\/li>\n<li><strong>Nordpolen:<\/strong>\u00a0Selvom isbj\u00f8rne i b\u00f8ger og endda p\u00e5 film er <a href=\"https:\/\/www.123fakta.com\/da\/fakta-om-pingviner\/\">pingviner<\/a> ofte ses side om side, men det er ikke tilf\u00e6ldet i virkeligheden, da pingviner kun findes omkring Antarktis (Sydpolen) og isbj\u00f8rne omkring Arktis (Nordpolen). Specifikt findes isbj\u00f8rne kun i de f\u00f8lgende 5 lande: Gr\u00f8nland, Norge, Rusland, USA og Canada<\/li>\n<li><strong>Store rovdyr:<\/strong>\u00a0Isbj\u00f8rne er de st\u00f8rste levende bj\u00f8rne og ogs\u00e5 de st\u00f8rste levende <a href=\"https:\/\/www.123fakta.com\/da\/fakta-om-rovdyr\/\">rovdyr<\/a> der kan jage p\u00e5 land. En isbj\u00f8rn kan blive op til 3 meter lang og veje op til 700 kg. Den gennemsnitlige skulderh\u00f8jde er 133 cm.<\/li>\n<li><strong>Bedste sv\u00f8mmer:<\/strong>\u00a0Selvom alle bj\u00f8rne er gode sv\u00f8mmere, er isbj\u00f8rnen uden tvivl den bedste; den kan sv\u00f8mme op til 160 km uden hvile, og i et tilf\u00e6lde har man set en bj\u00f8rn sv\u00f8mme 320 km uden stop! Isbj\u00f8rne kan ogs\u00e5 dykke<\/li>\n<li><strong>F\u00f8dsel:<\/strong>\u00a0Sammen med <a href=\"https:\/\/www.123fakta.com\/da\/fakta-om-pandabjorne\/\">Pandabj\u00f8rne<\/a>Isbj\u00f8rnen er den eneste af de to bj\u00f8rnearter, der f\u00f8des med pels.<\/li>\n<li><strong>Kuld:<\/strong>\u00a0Isbj\u00f8rne f\u00f8der normalt 2 unger ad gangen. Men enkelte unger og trillinger kan ogs\u00e5 forekomme, selvom det ofte er relateret til moderens helbred.<\/li>\n<li><strong>Jeg voksede op:<\/strong>\u00a0Isbj\u00f8rneunger bliver hos deres mor i op til 2 \u00bd \u00e5r for at l\u00e6re at jage og generelt klare sig i det arktiske milj\u00f8.<\/li>\n<li><strong>Havpattedyr:<\/strong>\u00a0Isbj\u00f8rnen er den eneste bj\u00f8rneart, der er klassificeret som et havpattedyr - et pattedyr, der tilbringer det meste af sit liv i havet.<\/li>\n<li><strong>Pelsede poter:<\/strong>\u00a0Isbj\u00f8rne er de eneste bj\u00f8rne, der har pels under poterne og mellem t\u00e6erne. Det skyldes, at bj\u00f8rne mister det meste af deres varme gennem poterne (og isbj\u00f8rne lever i et koldt klima).<\/li>\n<li><strong>Vinterdvale:<\/strong>\u00a0Isbj\u00f8rne g\u00e5r ikke i hi - det g\u00f8r kun brunbj\u00f8rne og amerikanske sortbj\u00f8rne. Men dr\u00e6gtige isbj\u00f8rne \"bygger rede\" og g\u00e5r i en slags hvileperiode under dr\u00e6gtigheden.<\/li>\n<\/ol>\n<figure id=\"attachment_7805\" aria-describedby=\"caption-attachment-7805\" style=\"width: 990px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7805\" src=\"https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoernes-habitat-2.jpg\" alt=\"Tilstedev\u00e6relsen af is er n\u00f8dvendig for, at isbj\u00f8rne kan fange s\u00e6ler.\" width=\"1000\" height=\"2092\" srcset=\"https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoernes-habitat-2.jpg 1000w, https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoernes-habitat-2-143x300.jpg 143w, https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoernes-habitat-2-489x1024.jpg 489w, https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoernes-habitat-2-768x1607.jpg 768w, https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoernes-habitat-2-734x1536.jpg 734w, https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoernes-habitat-2-979x2048.jpg 979w, https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoernes-habitat-2-6x12.jpg 6w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-7805\" class=\"wp-caption-text\">Navngivelse: David + Martin Lopatka + U.S. Fish and Wildlife Services - Flickr.com<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><em><strong>Uden is kan isbj\u00f8rne ikke fange s\u00e6ler - deres prim\u00e6re f\u00f8dekilde<\/strong><\/em><\/p>\n<h2>Jagt og fodring af isbj\u00f8rne<\/h2>\n<ul>\n<li><strong>Lugtesans:<\/strong>\u00a0En isbj\u00f8rns lugtesans er omkring 100 gange bedre end et menneskes. For eksempel kan en isbj\u00f8rn lugte et bytte p\u00e5 32 kilometers afstand og ogs\u00e5 lugte en d\u00f8d s\u00e6l under 90 cm is!<\/li>\n<li><strong>Er:<\/strong>\u00a0Selvom isbj\u00f8rne har langt de st\u00f8rste jagtomr\u00e5der af alle bj\u00f8rne, har de ogs\u00e5 begr\u00e6nsninger, fordi de er afh\u00e6ngige af is for at fange s\u00e6ler. N\u00e5r isen tr\u00e6kker sig tilbage om sommeren, sv\u00f8mmer de nogle gange hundredvis af kilometer for at f\u00f8lge isen og finde f\u00f8de. Hvis de bliver fanget p\u00e5 land om sommeren, er de tvunget til at vente p\u00e5, at vandet fryser til igen om efter\u00e5ret, da de sj\u00e6ldent fanger s\u00e6ler i det \u00e5bne hav.<\/li>\n<li><strong>Sp\u00e6k:<\/strong>\u00a0En isbj\u00f8rns mave kan rumme 68 kg k\u00f8d eller sp\u00e6k (fedt), og den har brug for 2 kg sp\u00e6k om dagen for at overleve. Isbj\u00f8rnens spisevaner - og muligheder for at spise - er dog generelt kendetegnet ved at veksle mellem at faste og spise store m\u00e5ltider. N\u00e5r jagten er god, foretr\u00e6kker isbj\u00f8rne kun at spise sp\u00e6k og kan endda spise op til 50 kg i \u00e9t m\u00e5ltid!<\/li>\n<li><strong>F\u00f8de:<\/strong>\u00a0Selvom isbj\u00f8rnenes prim\u00e6re f\u00f8de er s\u00e6ler, er de opportunistiske j\u00e6gere, der spiser n\u00e6sten alt, hvad de kan finde eller fange. Deres kost omfatter ogs\u00e5 gnavere, <a href=\"https:\/\/www.123fakta.com\/da\/fakta-om-fugle\/\">fugle<\/a>, <a href=\"https:\/\/www.123fakta.com\/da\/fakta-om-aeg\/\">\u00e6g<\/a>, <a href=\"https:\/\/www.123fakta.com\/da\/fakta-om-fisk\/\">fisk<\/a>, <a href=\"https:\/\/www.123fakta.com\/da\/fakta-om-hvaler\/\">Hvaler<\/a>, planter (herunder tang og b\u00e6r) og menneskeligt affald<\/li>\n<li><strong>Alfa-rovdyr:<\/strong>\u00a0Isbj\u00f8rne er i toppen af f\u00f8dek\u00e6den (s\u00e5kaldte 'alfa-pr\u00e6datorer'), hvilket blandt andet betyder, at de ikke har nogen naturlige fjender (dvs. rovdyr, der lever af isbj\u00f8rne).<\/li>\n<\/ul>\n<figure id=\"attachment_7807\" aria-describedby=\"caption-attachment-7807\" style=\"width: 990px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7807\" src=\"https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoerne-fakta-2.jpg\" alt=\"Fakta: Isbj\u00f8rnen er den st\u00f8rste bj\u00f8rneart og det st\u00f8rste nulevende rovdyr, der jager p\u00e5 land.\" width=\"1000\" height=\"668\" srcset=\"https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoerne-fakta-2.jpg 1000w, https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoerne-fakta-2-300x200.jpg 300w, https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoerne-fakta-2-768x513.jpg 768w, https:\/\/www.123fakta.com\/wp-content\/uploads\/isbjoerne-fakta-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-7807\" class=\"wp-caption-text\">Tilskrivning: Oleg. - Flickr.com<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><em><strong>Fakta: Ud over at v\u00e6re den st\u00f8rste bj\u00f8rneart er isbj\u00f8rne ogs\u00e5 de st\u00f8rste nulevende rovdyr, der kan jage p\u00e5 land. Her er to isbj\u00f8rne i kamp<\/strong><\/em><\/p>\n<h2>Myter og misforst\u00e5elser<\/h2>\n<ul>\n<li><em><strong>\"Isbj\u00f8rne d\u00e6kker deres sorte snude med poterne, n\u00e5r de jager, for at undg\u00e5 at blive opdaget af deres bytte.\"<\/strong><\/em>\u00a0(det g\u00f8r de ikke)<\/li>\n<li><strong>\"Isbj\u00f8rnes hule h\u00e5r leder UV-lys til deres sorte hud\"<\/strong>\u00a0(det g\u00f8r h\u00e5r ikke, og det er blevet testet og modbevist af en fysiker ved navn Daniel Koon).<\/li>\n<li><em><strong>\"Isbj\u00f8rne bruger v\u00e6rkt\u00f8j\"<\/strong><\/em>\u00a0(det g\u00f8r de ikke - selv om andre bj\u00f8rnearter g\u00f8r)<\/li>\n<li><em><strong>\"Isbj\u00f8rnen lever i symbiose med polarr\u00e6ven\"<\/strong><\/em>\u00a0(If\u00f8lge denne myte nyder isbj\u00f8rnen godt af polarr\u00e6vens \u00e5rv\u00e5genhed, n\u00e5r det g\u00e6lder jagt og mulige trusler, og til geng\u00e6ld deler isbj\u00f8rnen sin f\u00f8de med polarr\u00e6ven. Dette er dog ikke sandt; polarr\u00e6ve f\u00f8lger efter isbj\u00f8rne og spiser af deres rester, men isbj\u00f8rne finder dette mere irriterende end gavnligt).<\/li>\n<li><em><strong>\"Isbj\u00f8rne har venstre pote\"<\/strong><\/em>\u00a0(det er de ikke; forskere har endda fundet ud af - ved observation - at isbj\u00f8rne ikke har nogen pr\u00e6ference for deres lemmer og bruger dem lige meget)<\/li>\n<\/ul>\n<p>Du kan ogs\u00e5 se vores <a href=\"https:\/\/www.123fakta.com\/da\/fakta-om-bjorne\/\">artikel om bj\u00f8rne her<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Sort hud: En isbj\u00f8rns pels kan variere i farve fra n\u00e6sten kridhvid til elfenben - men dens hud er helt sort, hvilket hj\u00e6lper den med at absorbere varme fra solen Nordpolen: Selvom man i b\u00f8ger og endda film ofte ser isbj\u00f8rne og pingviner side om side, er det ikke tilf\u00e6ldet i virkeligheden, da ... <a title=\"Fakta om isbj\u00f8rne\" class=\"read-more\" href=\"https:\/\/www.123fakta.com\/da\/facts-about-polar-bears\" aria-label=\"L\u00e6s mere om fakta om isbj\u00f8rne\">L\u00e6s Mere<\/a><\/p>","protected":false},"author":1,"featured_media":7804,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"cybocfi_hide_featured_image":"","footnotes":""},"categories":[67,68],"tags":[120],"class_list":["post-852","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-animals","category-terrestrial-animals","tag-adsense"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fakta om isbj\u00f8rne - F\u00f8de, adf\u00e6rd, habitat osv.<\/title>\n<meta name=\"description\" content=\"Fact: Polar bears can smell their prey from 32 km away and a dead seal under 90 cm of ice! 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