When cats are happy, they may squeeze their eyes shut.
10
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
Dolphins have names for one another.
18
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
Domestic pigs average a top speed of about 11 miles per hour.
182