It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109
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
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
The seahorse is the only fish to have a neck.
12
A tortoise named Adwaita lived to 255 years old. To put it into perspective, he was born before the United States of America existed and his death was announced on CNN (1750-2006).
12
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Sloths take two weeks to digest their food.
243