A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A cow produces around 200,000 glasses of milk in her lifetime.
373
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
Nicole Kidman is scared of butterflies.
65
When you shave a guinea pig it looks like a little hippo.
19