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
Squirrels forget where they hide about half of their nuts.
698
A scorpion can hold its breath for up to 6 days.
19
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
The most expensive cow in the world was sold in 2009 for $1.2 million.
-3
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9