{"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-isbjorner","status":"publish","type":"post","link":"https:\/\/www.123fakta.com\/nb\/facts-about-polar-bears","title":{"rendered":"Fakta om isbj\u00f8rn"},"content":{"rendered":"<ol>\n<li><strong>Svart hud:<\/strong>\u00a0Isbj\u00f8rnens pels kan variere i farge fra nesten kritthvit til elfenben - men huden er helt svart, noe som hjelper den med \u00e5 absorbere solvarmen.<\/li>\n<li><strong>Nordpolen:<\/strong>\u00a0Selv om isbj\u00f8rner og isbj\u00f8rner i b\u00f8ker og til og med p\u00e5 film er <a href=\"https:\/\/www.123fakta.com\/nb\/fakta-om-pingviner\/\">pingviner<\/a> Ofte ser man pingviner og isbj\u00f8rner side om side, men dette er ikke tilfelle i virkeligheten, ettersom pingviner bare finnes rundt Antarktis (Sydpolen) og isbj\u00f8rner rundt Arktis (Nordpolen). N\u00e6rmere bestemt finnes isbj\u00f8rn bare i f\u00f8lgende 5 land: Gr\u00f8nland, Norge, Russland, USA og Canada<\/li>\n<li><strong>Store rovdyr:<\/strong>\u00a0Isbj\u00f8rnene er de st\u00f8rste n\u00e5levende bj\u00f8rnene, og ogs\u00e5 de st\u00f8rste n\u00e5levende <a href=\"https:\/\/www.123fakta.com\/nb\/fakta-om-rovdyr\/\">rovdyr<\/a> som kan jakte p\u00e5 land. En isbj\u00f8rn kan bli opptil 3 meter lang og veie opptil 700 kg. Gjennomsnittlig skulderh\u00f8yde er 133 cm.<\/li>\n<li><strong>Beste sv\u00f8mmer:<\/strong>\u00a0Selv om alle bj\u00f8rner er gode sv\u00f8mmere, er isbj\u00f8rnen uten tvil den beste; den kan sv\u00f8mme opptil 160 km uten hvile, og i ett tilfelle er det observert en bj\u00f8rn som har sv\u00f8mt 320 km uten \u00e5 stoppe! Isbj\u00f8rnen kan ogs\u00e5 dykke<\/li>\n<li><strong>F\u00f8dsel:<\/strong>\u00a0Sammen med <a href=\"https:\/\/www.123fakta.com\/nb\/fakta-om-pandabjorner\/\">Pandabj\u00f8rner<\/a>Isbj\u00f8rnen er den eneste av de to bj\u00f8rneartene som er f\u00f8dt med pels.<\/li>\n<li><strong>Kuld:<\/strong>\u00a0Isbj\u00f8rner f\u00f8der vanligvis to unger om gangen. Det kan imidlertid ogs\u00e5 forekomme enkeltunger og trillinger, selv om dette ofte er relatert til morens helse.<\/li>\n<li><strong>Jeg vokste opp:<\/strong>\u00a0Isbj\u00f8rnunger blir hos moren i opptil 2 \u00bd \u00e5r for \u00e5 l\u00e6re \u00e5 jakte og generelt klare seg i det arktiske milj\u00f8et.<\/li>\n<li><strong>Sj\u00f8pattedyr:<\/strong>\u00a0Isbj\u00f8rnen er den eneste bj\u00f8rnearten som er klassifisert som et sj\u00f8pattedyr - et pattedyr som tilbringer mesteparten av livet i havet.<\/li>\n<li><strong>Pelsede poter:<\/strong>\u00a0Isbj\u00f8rnen er den eneste bj\u00f8rnen som har pels under potene og mellom t\u00e6rne. Dette er fordi bj\u00f8rner mister mesteparten av varmen gjennom potene (og isbj\u00f8rner lever i et kaldt klima).<\/li>\n<li><strong>Vinterdvale:<\/strong>\u00a0Isbj\u00f8rner g\u00e5r ikke i hi - det er det bare brunbj\u00f8rner og amerikanske svartbj\u00f8rner som gj\u00f8r. Men drektige isbj\u00f8rner \"bygger rede\" og g\u00e5r inn i en slags hvileperiode under drektigheten.<\/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 av is er n\u00f8dvendig for at isbj\u00f8rnene skal kunne fange sel.\" 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\">Kildeangivelse: David + Martin Lopatka + U.S. Fish and Wildlife Services - Flickr.com<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><em><strong>Uten is kan isbj\u00f8rnen ikke fange sel, som er dens viktigste matkilde.<\/strong><\/em><\/p>\n<h2>Jakt og f\u00f4ring av isbj\u00f8rn<\/h2>\n<ul>\n<li><strong>Luktesans:<\/strong>\u00a0Isbj\u00f8rnens luktesans er omtrent 100 ganger bedre enn menneskets. Isbj\u00f8rnen kan for eksempel lukte byttedyr p\u00e5 32 kilometers avstand, og den kan ogs\u00e5 lukte en d\u00f8d sel under 90 cm is!<\/li>\n<li><strong>Er:<\/strong>\u00a0Selv om isbj\u00f8rnen har de desidert st\u00f8rste jaktomr\u00e5dene av alle bj\u00f8rner, har den ogs\u00e5 begrensninger fordi den er avhengig av is for \u00e5 fange sel. N\u00e5r isen trekker seg tilbake om sommeren, sv\u00f8mmer de noen ganger hundrevis av kilometer for \u00e5 f\u00f8lge isen og finne mat. Hvis de blir fanget p\u00e5 land om sommeren, m\u00e5 de vente til vannet fryser til igjen om h\u00f8sten, ettersom de sjelden fanger sel i \u00e5pent hav.<\/li>\n<li><strong>Smult:<\/strong>\u00a0Isbj\u00f8rnens mage kan romme 68 kg kj\u00f8tt eller spekk (fett), og den trenger 2 kg spekk per dag for \u00e5 overleve. Isbj\u00f8rnens spisevaner - og muligheter til \u00e5 spise - er imidlertid generelt preget av en veksling mellom faste og store m\u00e5ltider. N\u00e5r jakten er god, spiser isbj\u00f8rnen helst bare spekk og kan til og med spise opptil 50 kg i ett m\u00e5ltid!<\/li>\n<li><strong>Mat:<\/strong>\u00a0Selv om isbj\u00f8rnens hovedf\u00f8de er sel, er den en opportunistisk jeger som spiser nesten alt den kan finne eller fange. De spiser ogs\u00e5 gnagere, <a href=\"https:\/\/www.123fakta.com\/nb\/fakta-om-fugler\/\">Fugler<\/a>, <a href=\"https:\/\/www.123fakta.com\/nb\/fakta-om-egg\/\">egg<\/a>, <a href=\"https:\/\/www.123fakta.com\/nb\/fakta-om-fisk\/\">fisk<\/a>, <a href=\"https:\/\/www.123fakta.com\/nb\/fakta-om-hvaler\/\">Hvaler<\/a>, planter (inkludert tang og b\u00e6r) og menneskelig avfall.<\/li>\n<li><strong>Alfa-predator:<\/strong>\u00a0Isbj\u00f8rnen er p\u00e5 toppen av n\u00e6ringskjeden (s\u00e5kalte \"alfapredatorer\"), noe som blant annet betyr at den ikke har noen naturlige fiender (dvs. rovdyr som spiser isbj\u00f8rn).<\/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\u00f8rnearten og det st\u00f8rste n\u00e5levende rovdyret som jakter 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\">Attribusjon: Oleg. - Flickr.com<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><em><strong>Fakta: I tillegg til \u00e5 v\u00e6re den st\u00f8rste bj\u00f8rnearten er isbj\u00f8rnen det st\u00f8rste n\u00e5levende rovdyret som kan jakte p\u00e5 land. Her er to isbj\u00f8rner i kamp<\/strong><\/em><\/p>\n<h2>Myter og misforst\u00e5elser<\/h2>\n<ul>\n<li><em><strong>\"Isbj\u00f8rner dekker den svarte snuten med potene n\u00e5r de jakter for \u00e5 unng\u00e5 \u00e5 bli oppdaget av byttet.\"<\/strong><\/em>\u00a0(det gj\u00f8r de ikke)<\/li>\n<li><strong>\"Isbj\u00f8rnens hule h\u00e5r leder UV-lyset mot den svarte huden\"<\/strong>\u00a0(h\u00e5r gj\u00f8r ikke det, og det har blitt testet og motbevist av en fysiker ved navn Daniel Koon).<\/li>\n<li><em><strong>\"Isbj\u00f8rner bruker verkt\u00f8y\"<\/strong><\/em>\u00a0(det gj\u00f8r de ikke - selv om andre bj\u00f8rnearter gj\u00f8r det).<\/li>\n<li><em><strong>\"Isbj\u00f8rnen lever i symbiose med fjellreven\"<\/strong><\/em>\u00a0(If\u00f8lge denne myten nyter isbj\u00f8rnen godt av fjellrevens \u00e5rv\u00e5kenhet n\u00e5r det gjelder jakt og mulige trusler, og til gjengjeld deler isbj\u00f8rnen maten sin med fjellreven. Dette stemmer imidlertid ikke; fjellreven f\u00f8lger etter isbj\u00f8rnen og forsyner seg av matrester, men isbj\u00f8rnen synes dette er mer irriterende enn nyttig).<\/li>\n<li><em><strong>\"Isbj\u00f8rner har venstre tass\"<\/strong><\/em>\u00a0(det er de ikke; forskere har til og med funnet ut - ved observasjon - at isbj\u00f8rner ikke har noen preferanse for lemmene sine og bruker dem likt).<\/li>\n<\/ul>\n<p>Du kan ogs\u00e5 se v\u00e5r <a href=\"https:\/\/www.123fakta.com\/nb\/fakta-om-bjorner\/\">artikkel om bj\u00f8rner her<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Svart hud: Isbj\u00f8rnens pels kan variere i farge fra nesten kritthvit til elfenbensfarget - men huden er helt svart, noe som hjelper den med \u00e5 absorbere varme fra solen Nordpolen: Selv om isbj\u00f8rner og pingviner ofte blir sett side om side i b\u00f8ker og til og med p\u00e5 film, er dette ikke tilfelle i virkeligheten, da ... <a title=\"Fakta om isbj\u00f8rn\" class=\"read-more\" href=\"https:\/\/www.123fakta.com\/nb\/facts-about-polar-bears\" aria-label=\"Les mer om fakta om isbj\u00f8rn\">Les mer<\/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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