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Own every animal of the family Muridae.
Old World rats and mice form one of the largest families of mammals. Like all rodents, they have incisors that never stop growing. Several species followed humans on their travels. They now live almost everywhere on Earth. They breed very quickly. They eat almost anything they find.
The start of their anecdote. The album's other cards are for you to discover in the game.
Muridae
Mus minutoides · Least concern
Just 5 g on average: it is one of the smallest rodents on earth. Yet this tiny African mouse is an excellent climber and can jump up to 50 cm. Its young are born blind and hairless after a 20-day pregnancy, weighing only 0.8 g.
Photo: Alouise Lynch (CC BY-SA 4.0)
Muridae
Rattus norvegicus · Least concern
Nobody knows for sure why the brown rat is called Rattus norvegicus: it did not come from Norway, but probably from northern China. In 18th-century England it was dubbed the 'Hanover rat' by people eager to link problems to the House of Hanover.
Photo: National Park Service (Public domain)
Muridae
Micromys minutus · Least concern
The smallest European rodent can weigh as little as 4 g. It climbs with its prehensile tail and weaves round breeding nests of grass high up on stems. It is protected in Britain, and in 2025 two 13-year-old girls led a project in Devon to help bring it back.
Photo: Charlie Marshall (CC BY 2.0)
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