Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
The male seahorse carries babies and 'gives birth' to them instead of the female.
7
Denmark has twice as many pigs as there are people.
66
When dragonflies mate, their tails form a love heart.
22
Cats and dogs can hear ultrasound.
350