The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
10
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
57
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12