The Basenji dog is the only dog that is not able to bark.
4
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
A cow produces around 200,000 glasses of milk in her lifetime.
373
The seahorse is the only fish to have a neck.
12
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The oldest recorded elephant lived for 82 years.
213