The three-toed sloth is different from the two-toed sloth in that it has one more finger.
三趾树懒和二趾树懒的区别是它要多一根脚趾。
Two-toed sloth. From Brehms Tierleben (Brehm's animal life) vol. 2, under the direction of Alfred Edmund Brehm, Leipzig Vienna, 1900.
两趾树懒，选自《布雷姆的动物生命》第2卷，莱比锡维也纳，1900年。
Two-toed sloth. From Brehms Tierleben (Brehm's animal life) vol. 2, under the direction of Alfred Edmund Brehm, Leipzig Vienna, 1900.
两趾树懒，选自《布雷姆的动物生命》第2卷，莱比锡维也纳，1900年。
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