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Rodents (from Latin rodere, 'to gnaw') are mammals of the order Rodentia ( / roʊˈdɛnʃə / roh-DEN-shə ), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents.
- Rat
Rats are various medium-sized, long-tailed rodents. ...
- List of rodents
List of rodents. Rattus norvegicus. Rodents are animals ...
- Brown rat
The brown rat (Rattus norvegicus), also known as the ...
- Rat
囓齒目的英文學名 Rodent 就是來自拉丁文 rodere (啃) [6] [7] 。 這些牙齒可用來切斷樹幹、咬開果實外皮或做為防衛用途。 囓齒目動物的牙齒外面有 琺瑯質 ,裡面有外露的 象牙質 ,所以可以在咬囓之間自行磨尖。 囓齒目動物沒有 犬牙 ,在 門牙 和 前臼齒 中間留有縫隙。 幾乎所有的囓齒目動物都以植物為食,尤其是以種子為食,但也有少數例外,會吃昆蟲或魚類。 一些松鼠甚至會吃如 主紅雀科 和 藍松鴉 等 雀形目 的 鳥類 。 體形 [ 編輯] 水豚 ,現存最大的囓齒目動物,可重達65公斤。 許多的囓齒目動物都很小: 南非小家鼠 的成鼠只會長至6公分長及7公克重, 西南亞侏儒跳鼠 也有相似或稍小的尺寸。
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Capybaras. Rodents (from Latin rodere, "to gnaw"), are mammals of the order Rodentia, which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. Description. Rodents comprise about 40% of all mammal species.