Joey the Koala was born 6 months ago at a Cleveland, Ohio, zoo. He ventured out of his mom's pouch for the first time on October 3—and fell asleep! Here are the animal kingdom's biggest sleepyheads:
1. Koala
sleeps 22 hours a day
2. Sloth
20 hours
3. Armadillo & Opossum
(tied) 19 hours
4. Lemur
16 hours
5. Hamster & Squirrel
(tied) 14 hours