Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Mosquitoes don't just bite you, they also pee on you.
11
The reindeer is the only mammal that can see UV light.
17
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
Dogs sometimes fake being sick to get attention.
26