Audubon's birds have been released to Public Domain! John James Audubon's book Birds of America is usually listed among the rarest books in existence. The reason for this is that the French ornithologist used the laborious technique of hand-coloured etched and aquatint plates, which means that there only about 200 complete sets done. A set fetched £7.3m at auction ...

There are an estimated 42 species of bird of paradise in New Guinea, and they all look completely different. Females choose mates based on the condition and colour of the males’ plumage, so males puff their feathers, vibrate and buzz to attract their attention. Some even transform their bodies into strange, geometrical abstractions. If successful, these aesthetically ...