藝術與建築詞典根目錄
....代理者層面
........活體有機體
............真核生物 (域)
................動物界 (界)
....................脊索動物門 (門)
........................脊椎動物亞門 (亞門)
............................哺乳綱 (綱)
................................囓齒目 (目)
....................................松鼠科 (科)
|||........................................草原犬鼠屬 (屬)
........................................灰松鼠屬 (屬)
|||............................................北美灰松鼠 (種)
|||............................................美西灰松鼠 (種)
|||............................................黑松鼠 (種)
........................................旱獺屬 (屬)
|||............................................美洲旱獺 (種)
|||........................................美洲金花鼠 (屬)
........................................松鼠
|||............................................北美灰松鼠 (種) [N]
|||............................................美西灰松鼠 (種) [N]
|||............................................黑松鼠 (種) [N]
....................................河狸科 (科)
|||........................................河狸屬 (屬)