The cat brain weighs about 30g.
167
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
When the "Elephant Whisperer" Lawrence Anthony died, a whole herd of elephants arrived at his house to mourn him.
25
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
The Hercules beetle, despite weighing only 100 grams, can lift 8 kilograms, making it one of the proportionally strongest animals in the world.
8
Female kangaroos have three vaginas.
2
It has been estimated that a bite from a grizzly bear can crush a bowling ball.
11