Cows can sleep standing up, but they can only dream lying down.
745
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
Cats and dogs can hear ultrasound.
350
The largest earthworm on record was found in South Africa and measured 22 feet.
151
There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
40
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
The cat brain weighs about 30g.
167