Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
George was the world's largest dog who weighed 233 pounds, stood at 43 inches tall from paw to shoulder, and ate 180 pounds of food a month.
7
Allegedly, Chrysippus, the Greek philosopher, died of laughter after getting his donkey drunk and watching it try to eat figs.
47
The difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.
10
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The seahorse is the only fish to have a neck.
12