Dogs have been man's pet for over 14,000 years.
224
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Cats recognise the voice of their owner, but never evolved to care.
22
Cows can sleep standing up, but they can only dream lying down.
745
Mosquitoes don't just bite you, they also pee on you.
11
In 1918, a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
22
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6