Do you ever wake up in the morning feeling so tired that you don't want to get out of bed? If you were a sloth, that wouldn't be a problem!
Every day, sloths spend 15 to 18 hour sleeping. Even when they are awake, they move very slowly. In fact, sloths only move two to three meters per minute, which makes them the slowest mammals in the world.
Even though it might seem that sloths are just lazy, moving so little gives them a lot of advantages. Because sloths move so slowly, it is hard for predators to see them. Also, they don't have to eat very much food because they use so little energy moving around.
The only problem is that sometimes sloths move so little that they don't see another sloth for a whole year! (Marc Langer, staff writer)
你曾經早上起床覺得很累，所以不想起床？假如你是樹獺，這一點都不成問題！
樹獺每天睡十五到十八個小時。即使牠們醒來，行動也相當遲緩。事實上，樹獺每分鐘只移動二到三公尺，這讓牠們成為世界上最遲緩的動物。
即使樹獺看起來很懶散，行動遲緩也給了牠們不少好處。由於樹獺移動緩慢，獵食者很難發現牠們。此外，牠們移動時只消耗一點點精力，所以不必吃太多食物。
唯一的問題是，有時候樹獺動得太少了，所以牠們一整年都看不到同類！
（翻譯：賴美君）