Which animal sleeps 16 hours a day?

Scientific research indicates that it is a close contest for the title of the animal which sleeps the most. Top contenders are the Brown Bat and the Koala, both of which sleep between 18 and 20 hours a day.

Surprisingly, the sloth is not even in the top ten. A fairly recent study from Germany on sloths in the wild indicates the sloth sleeps for just under 10 hours a day.