- Sharks are the only animals that never get sick - they are believed to be immune to every known disease.

 - No two zebras have the same markings.

 - The heaviest cat ever recorded was Himmy, a neutered tabby living in Australia who weighed in at 46 pounds. He died of heart failure.

 - Sea otters use so much energy that they need to eat as much as 1/3 of their weight each day.

 - Over 10,000 birds die a year from smashing into windows.