The most yolks ever found in one chicken egg was nine.
163
Alligators can live up to 100 years.
337
A duck's quack doesn't echo, and no one knows why.
173
A blue whale's aorta (the main blood vessel) is large enough for a human to crawl through.
52
The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2
Beavers can swim half a mile underwater on one gulp of air.
31