牛犬鼠(学名:Rattus nativitatis)是鼠科大鼠属的一种,栖息在印度洋圣诞岛高山及密林内。它们的尾巴短小,背部有一层2厘米厚的脂肪。它们以细小的群族居住,在树根或树孔内筑巢。它们懒洋洋的,日间从不攀树。最后见到它们是于1903年。它们的灭绝可能是因黑鼠带来的传染病所造成的。[1][2]
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