Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
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 newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
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
When a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.
5
A group of pugs is called a grumble.
10
Cats sleep for 70% of their lives.
8