{"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-isbjornar","status":"publish","type":"post","link":"https:\/\/www.123fakta.com\/se\/facts-about-polar-bears","title":{"rendered":"Fakta om isbj\u00f6rnar"},"content":{"rendered":"<ol>\n<li><strong>Svart hud:<\/strong>\u00a0En isbj\u00f6rns p\u00e4ls kan variera i f\u00e4rg fr\u00e5n n\u00e4stan kritvit till elfenbensf\u00e4rgad - men dess hud \u00e4r helt svart, vilket hj\u00e4lper den att absorbera v\u00e4rme fr\u00e5n solen<\/li>\n<li><strong>Nordpolen:<\/strong>\u00a0\u00c4ven om isbj\u00f6rnar i b\u00f6cker och till och med filmer <a href=\"https:\/\/www.123fakta.com\/se\/fakta-om-pingviner\/\">pingviner<\/a> ofta ses sida vid sida, \u00e4r detta inte fallet i verkligheten, eftersom pingviner bara finns runt Antarktis (Sydpolen) och isbj\u00f6rnar runt Arktis (Nordpolen). N\u00e4rmare best\u00e4mt finns isbj\u00f6rnar bara i f\u00f6ljande 5 l\u00e4nder: Gr\u00f6nland, Norge, Ryssland, USA och Kanada<\/li>\n<li><strong>Stora rovdjur:<\/strong>\u00a0Isbj\u00f6rnar \u00e4r de st\u00f6rsta levande bj\u00f6rnarna och \u00e4ven de st\u00f6rsta levande <a href=\"https:\/\/www.123fakta.com\/se\/fakta-om-rovdjur\/\">Rovdjur<\/a> som kan jaga p\u00e5 land. En isbj\u00f6rn kan bli upp till 3 meter l\u00e5ng och v\u00e4ga upp till 700 kg. Den genomsnittliga axelh\u00f6jden \u00e4r 133 cm<\/li>\n<li><strong>B\u00e4sta simmare:<\/strong>\u00a0\u00c4ven om alla bj\u00f6rnar \u00e4r bra simmare \u00e4r isbj\u00f6rnen utan tvekan den b\u00e4sta; den kan simma upp till 160 km utan att vila och i ett fall har en bj\u00f6rn observerats simma 320 km utan att stanna! Isbj\u00f6rnar kan ocks\u00e5 dyka<\/li>\n<li><strong>F\u00f6dd:<\/strong>\u00a0Tillsammans med <a href=\"https:\/\/www.123fakta.com\/se\/fakta-om-pandabjornar\/\">Pandabj\u00f6rnar<\/a>isbj\u00f6rnen \u00e4r den enda av de tv\u00e5 bj\u00f6rnarterna som f\u00f6ds med p\u00e4ls<\/li>\n<li><strong>Kuld:<\/strong>\u00a0Isbj\u00f6rnar f\u00f6der vanligtvis 2 ungar \u00e5t g\u00e5ngen. Enstaka ungar och trillingar kan dock ocks\u00e5 f\u00f6rekomma, \u00e4ven om detta ofta \u00e4r relaterat till moderns h\u00e4lsa<\/li>\n<li><strong>Uppv\u00e4xt:<\/strong>\u00a0Isbj\u00f6rnsungar stannar hos sin mamma i upp till 2 \u00bd \u00e5r f\u00f6r att l\u00e4ra sig att jaga och klara sig i den arktiska milj\u00f6n<\/li>\n<li><strong>Marina d\u00e4ggdjur:<\/strong>\u00a0Isbj\u00f6rnen \u00e4r den enda bj\u00f6rnart som klassificeras som ett marint d\u00e4ggdjur - ett d\u00e4ggdjur som tillbringar st\u00f6rre delen av sitt liv i havet<\/li>\n<li><strong>P\u00e4lsiga tassar:<\/strong>\u00a0Isbj\u00f6rnen \u00e4r den enda bj\u00f6rn som har p\u00e4ls under tassarna och mellan t\u00e5rna. Detta beror p\u00e5 att bj\u00f6rnar f\u00f6rlorar det mesta av sin v\u00e4rme genom sina tassar (och isbj\u00f6rnar lever i ett kallt klimat)<\/li>\n<li><strong>Vinterdvala:<\/strong>\u00a0Isbj\u00f6rnar g\u00e5r inte i ide - det g\u00f6r bara brunbj\u00f6rnar och amerikanska svartbj\u00f6rnar. Dr\u00e4ktiga isbj\u00f6rnar \"bygger dock bo\" och g\u00e5r in i en slags viloperiod under dr\u00e4ktigheten<\/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=\"F\u00f6rekomsten av is \u00e4r n\u00f6dv\u00e4ndig f\u00f6r att isbj\u00f6rnar ska kunna f\u00e5nga s\u00e4lar\" 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\">Tillskrivning: David + Martin Lopatka + U.S. Fish and Wildlife Services - Flickr.com<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><em><strong>Utan is kan isbj\u00f6rnarna inte f\u00e5nga s\u00e4lar - deras fr\u00e4msta f\u00f6dok\u00e4lla<\/strong><\/em><\/p>\n<h2>Jakt och utfodring av isbj\u00f6rnar<\/h2>\n<ul>\n<li><strong>Luktsinne:<\/strong>\u00a0En isbj\u00f6rns luktsinne \u00e4r ungef\u00e4r 100 g\u00e5nger b\u00e4ttre \u00e4n en m\u00e4nniskas. En isbj\u00f6rn kan till exempel k\u00e4nna lukten av ett byte p\u00e5 32 km avst\u00e5nd och \u00e4ven k\u00e4nna lukten av en d\u00f6d s\u00e4l under 90 cm is!<\/li>\n<li><strong>\u00c4r:<\/strong>\u00a0\u00c4ven om isbj\u00f6rnar har de \u00f6verl\u00e4gset st\u00f6rsta jaktmarkerna av alla bj\u00f6rnar, har de ocks\u00e5 begr\u00e4nsningar eftersom de \u00e4r beroende av is f\u00f6r att f\u00e5nga s\u00e4lar. N\u00e4r isen drar sig tillbaka p\u00e5 sommaren simmar de ibland hundratals kilometer f\u00f6r att f\u00f6lja isen och hitta f\u00f6da. Om de f\u00e5ngas p\u00e5 land under sommaren tvingas de v\u00e4nta p\u00e5 att vattnet ska frysa igen p\u00e5 h\u00f6sten, eftersom de s\u00e4llan f\u00e5ngar s\u00e4lar p\u00e5 \u00f6ppet hav.<\/li>\n<li><strong>Lard:<\/strong>\u00a0En isbj\u00f6rns mage kan rymma 68 kg k\u00f6tt eller sp\u00e4ck (fett) och den beh\u00f6ver 2 kg sp\u00e4ck per dag f\u00f6r att \u00f6verleva. Isbj\u00f6rnarnas matvanor - och m\u00f6jligheter att \u00e4ta - k\u00e4nnetecknas dock i allm\u00e4nhet av att de v\u00e4xlar mellan fasta och att \u00e4ta stora m\u00e5ltider. N\u00e4r jakten \u00e4r god \u00e4ter isbj\u00f6rnen helst bara sp\u00e4ck och kan till och med \u00e4ta upp till 50 kg i en m\u00e5ltid!<\/li>\n<li><strong>Mat:<\/strong>\u00a0\u00c4ven om isbj\u00f6rnarnas huvudsakliga f\u00f6da \u00e4r s\u00e4lar \u00e4r de opportunistiska j\u00e4gare som \u00e4ter n\u00e4stan allt de kan hitta eller f\u00e5nga. De \u00e4ter \u00e4ven gnagare, <a href=\"https:\/\/www.123fakta.com\/se\/fakta-om-faglar\/\">f\u00e5glar<\/a>, <a href=\"https:\/\/www.123fakta.com\/se\/fakta-om-agg\/\">\u00e4gg<\/a>, <a href=\"https:\/\/www.123fakta.com\/se\/fakta-om-fisk\/\">fisk<\/a>, <a href=\"https:\/\/www.123fakta.com\/se\/fakta-om-valar\/\">valar<\/a>, v\u00e4xter (inklusive alger och b\u00e4r) och m\u00e4nskligt avfall<\/li>\n<li><strong>Alfa-rovdjur:<\/strong>\u00a0Isbj\u00f6rnar befinner sig h\u00f6gst upp i n\u00e4ringskedjan (s\u00e5 kallade \"alfapredatorer\"), vilket bland annat inneb\u00e4r att de inte har n\u00e5gra naturliga fiender (dvs. rovdjur som livn\u00e4r sig p\u00e5 isbj\u00f6rnar)<\/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\u00f6rnen \u00e4r den st\u00f6rsta bj\u00f6rnarten och det st\u00f6rsta levande rovdjuret som jagar 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\">Tillskrivning: Oleg. - Flickr.com<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><em><strong>Fakta: F\u00f6rutom att vara den st\u00f6rsta bj\u00f6rnarten \u00e4r isbj\u00f6rnen det st\u00f6rsta levande rovdjuret som kan jaga p\u00e5 land. H\u00e4r \u00e4r tv\u00e5 isbj\u00f6rnar som sl\u00e5ss<\/strong><\/em><\/p>\n<h2>Myter och missuppfattningar<\/h2>\n<ul>\n<li><em><strong>\"Isbj\u00f6rnar t\u00e4cker sin svarta nos med tassarna n\u00e4r de jagar f\u00f6r att undvika att bli uppt\u00e4ckta av sina byten\"<\/strong><\/em>\u00a0(det g\u00f6r de inte)<\/li>\n<li><strong>\"Isbj\u00f6rnarnas ih\u00e5liga h\u00e5r leder UV-ljus till deras svarta hud\"<\/strong>\u00a0(h\u00e5rstr\u00e5n g\u00f6r inte det och det har testats och motbevisats av en fysiker vid namn Daniel Koon)<\/li>\n<li><em><strong>\"Isbj\u00f6rnar anv\u00e4nder verktyg\"<\/strong><\/em>\u00a0(det g\u00f6r de inte - \u00e4ven om andra bj\u00f6rnarter g\u00f6r det)<\/li>\n<li><em><strong>\"Isbj\u00f6rnen lever i symbios med fj\u00e4llr\u00e4ven\"<\/strong><\/em>\u00a0(Enligt denna myt drar isbj\u00f6rnen nytta av fj\u00e4llr\u00e4vens vaksamhet n\u00e4r det g\u00e4ller jakt och eventuella hot, och i geng\u00e4ld delar isbj\u00f6rnen sin f\u00f6da med fj\u00e4llr\u00e4ven. Detta \u00e4r dock inte sant; fj\u00e4llr\u00e4var f\u00f6ljer isbj\u00f6rnar och \u00e4ter av deras matrester, men isbj\u00f6rnar tycker att detta \u00e4r mer irriterande \u00e4n f\u00f6rdelaktigt)<\/li>\n<li><em><strong>\"Isbj\u00f6rnar har v\u00e4nster tass\"<\/strong><\/em>\u00a0(det \u00e4r de inte; forskare har till och med funnit - genom observation - att isbj\u00f6rnar inte har n\u00e5gra preferenser f\u00f6r sina lemmar utan anv\u00e4nder dem p\u00e5 samma s\u00e4tt)<\/li>\n<\/ul>\n<p>Du kan ocks\u00e5 se v\u00e5r <a href=\"https:\/\/www.123fakta.com\/se\/fakta-om-bjornar\/\">artikel om bj\u00f6rnar h\u00e4r<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Svart hud: En isbj\u00f6rns p\u00e4ls kan variera i f\u00e4rg fr\u00e5n n\u00e4stan kritvit till elfenbensf\u00e4rgad - men dess hud \u00e4r helt svart, vilket hj\u00e4lper den att absorbera v\u00e4rme fr\u00e5n solen Nordpolen: \u00c4ven om man i b\u00f6cker och filmer ofta ser isbj\u00f6rnar och pingviner sida vid sida, s\u00e5 \u00e4r det inte s\u00e5 i verkligheten, eftersom isbj\u00f6rnar och pingviner... <a title=\"Fakta om isbj\u00f6rnar\" class=\"read-more\" href=\"https:\/\/www.123fakta.com\/se\/facts-about-polar-bears\" aria-label=\"L\u00e4s mer om Fakta om isbj\u00f6rnar\">L\u00e4s 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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