Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
57
Urechis unicinctus is a species of marine spoon worm that is widely referred to as the ‘penis fish’.
2
Sharks, like other fish, have their reproductive organs in their chests.
248
An average cat has 1-8 kittens per litter and can have 2-3 litters per year. During her productive life, one female cat could have more than 100 kittens. A single pair of cats and their kittens can produce as many as 420,000 kittens in just 7 years.
10
The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
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