The elephant brain weighs about 6,000g.
274
Cows can sleep standing up, but they can only dream lying down.
745
The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Whales and dolphins can't taste anything other than salt.
11
Squirrels forget where they hide about half of their nuts.
698