三趾树懒每天要睡9.6小时。
The three-toed sloth sleeps 9.6 hours nightly .
这其中包括三趾树懒，它们只生活在巴拿马并且不到500只。
That includes the pygmy three-toed sloth , they are only found in Panama , and there are less than 500 of them .
三趾树懒