Eyesight
Wow. Cows and manatees have some seriously bad eyesight. I should know, 'cause mine is almost as bad as that described below:
By varying the distance between the lines, the researchers showed that Buffett’s eyesight was about 20/420, similar to a cow’s and far worse than a human’s.
This NYTimes piece on manatees is pretty cool. It makes me feel bad for hating on Florida manatees when I was a kid (I preferred Florida panthers). If you, like me, were once a manatee-hater, check it out. They're not as stupid as we thought!