Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
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
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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The Platypus used to be considered a myth like Bigfoot and the Yeti.
18
There is a sea snail that wears a suit of iron plated armor. It is the only known animal to use iron sulphide as skeletal material.
9
In 1955, the citizens of São Paulo were so upset with their government that they elected a rhinoceros named Cacareco (meaning rubbish) to the city council in protest, with over 100,000 votes.
18
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23