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R\u00e5ttor<\/strong><\/h2>\n

Brunr\u00e5ttan \u00e4r den vanligaste arten vi har i Sverige, svartr\u00e5ttan d\u00e4remot \u00e4r mer ovanlig. En r\u00e5tta kan bli upp till 25 cm l\u00e5ng utan svansen inr\u00e4knad som brukar vara 17-20 cm l\u00e5ng bara den. Vid dryga tv\u00e5 m\u00e5naders \u00e5lder blir den k\u00f6nsmogen och en hona f\u00e5r ca 3-6 kullar om \u00e5ret med 6-12 ungar i varje. En hona \u00e4r normalt dr\u00e4ktig i 24-25 dagar. I ett experiment med en hona och en hane blev ca 800 nya individer till p\u00e5 ett \u00e5r. R\u00e5ttor \u00e4r all\u00e4tare men f\u00f6redrar feta produkter. Medellivsl\u00e4ngden i det vilda ligger p\u00e5 ungef\u00e4r 6 m\u00e5nader. De r\u00f6r sig i lodr\u00e4ta utrymmen och p\u00e5tr\u00e4ffas oftast utomhus i marken, under byggnader eller i avloppssystem. R\u00e5ttor s\u00f6ker sig ofta in i byggnader och en springa p\u00e5 13 mm r\u00e4cker f\u00f6r att de ska tas sig in. De \u00e4r duktiga kl\u00e4ttrare och kan hoppa upp till 1,5 m. Det finns ocks\u00e5 risk att de b\u00e4r med sig sjukdomar som sorkfeber, harpest och leptospiros (zoonos).<\/p>\n

S\u00e5 undviker du dem:<\/strong><\/p>\n