A scorpion can hold its breath for up to 6 days.
19
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
Penguins have a gland above their eye that turns saltwater into freshwater.
12
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
The Basenji dog is the only dog that is not able to bark.
4
During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
45