Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Dogs sometimes fake being sick to get attention.
26
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
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
Worker bees must visit around 4,000 flowers in order to make one tablespoon of honey.
5
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
402
Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
57