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为什么树懒这么慢

Prehistoric ground sloths first appeared around 35 million years ago.

大约3500万年前，史前陆地树懒开始出现。

Dozens of species lived across North, Central and South America,

许多物种生活在北美、中美和南美洲，

alongside other ancient creatures like mastodons and giant armadillos.

同时生活在那里的还有其它远古生物，比如乳齿象和巨型犰狳。

英语相关

Some ground sloths, like the megalonychid, were cat-sized, but many were massive.

一些陆地树懒像猫一样大小，如Megalonychid，但很多体型庞大。

Jefferson's sloth, Megalonyx, weighed about a ton, and that was small compared to megatherium,

杰斐逊收到的树懒，巨爪地懒，大约有一吨重，但还比不上大懒兽，

which could reach six metric tons, as much as an elephant.

大懒兽可重达六吨，比得上一头大象。