Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
The cat brain weighs about 30g.
167
George was the world's largest dog who weighed 233 pounds, stood at 43 inches tall from paw to shoulder, and ate 180 pounds of food a month.
7
In Australia, there are spiders big enough to eat snakes.
20
Bats sleep 18-20 hours per day.
5
Sharks have been on the planet longer than trees.
14