The cat brain weighs about 30g.
167
Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
17
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
The Hercules beetle, despite weighing only 100 grams, can lift 8 kilograms, making it one of the proportionally strongest animals in the world.
8
Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
23
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13