Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
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
Dogs sometimes fake being sick to get attention.
26
Gorillas can catch human colds and other illnesses.
205
Squirrels forget where they hide about half of their nuts.
698
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
The most expensive cow in the world was sold in 2009 for $1.2 million.
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