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
The reindeer is the only mammal that can see UV light.
17
Cats and dogs can hear ultrasound.
350
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
Gorillas can catch human colds and other illnesses.
205
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19