Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
The cat brain weighs about 30g.
167
Mahatma Gandhi used to travel with his goat so that he could have fresh milk.
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
Cats recognise the voice of their owner, but never evolved to care.
22
Whales and dolphins can't taste anything other than salt.
11