The most expensive cow in the world was sold in 2009 for $1.2 million.
-3
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 hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The elephant brain weighs about 6,000g.
274
Dolphins have names for one another.
18
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
45