World’s most expensive book sold

John James Audubon’s Birds of America has finally sold for £7.3 million at Sotheby’s London. Ten years ago, it sold for £5.7 million so it looks like the value keeps going up.

The rare book, measuring more than 3 ft by 2 ft features 1,000 life-sized illustrations of nearly 500 breeds.

The famous wildlife artist spent 12 years to complete his study and during the time, he traveled across America to shoot the birds. After that, he hung the birds on a wire to paint the illustrations of them.