When cats are happy, they may squeeze their eyes shut.
10
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
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
There's a young hippo and a 130+ year old tortoise in a Kenyan wildlife preserve who are best friends and they even sleep and play together.
40
It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
492
In Australia, there are spiders big enough to eat snakes.
20