然后他们在三趾树懒的基因组中发现了同样的病毒。
They then found the same virus lurking in the genome of the three-toed sloth.
三趾树懒每天要睡9.6小时。
三趾树懒和二趾树懒的区别是它要多一根脚趾。
The three-toed sloth is different from the two-toed sloth in that it has one more finger.
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.
在北京动物园的美国动物展区有几只二趾树懒，在最近这段日子里非常受欢迎。
At Beijing Zoo, the American animal enclosure, which has several two-toed sloths, has been very popular in recent days.
在北京动物园的美国动物展区有几只二趾树懒，在最近这段日子里非常受欢迎。
At Beijing Zoo, the American animal enclosure, which has several two-toed sloths, has been very popular in recent days.
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