The reindeer is the only mammal that can see UV light.
17
There's a young hippo and a 130+ year old tortoise in a Kenyan wildlife preserve who are best friends and they even sleep and play together.
40
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
When dragonflies mate, their tails form a love heart.
22
An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
11