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
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Bats sleep 18-20 hours per day.
5
Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12