It was raining in the small, mountainous country of Llamedos. It was always raining in Llamedos. Rain was the country's main export. It had rain mines.
Terry PratchettMost species do their own evolving, making it up as they go along, which is the way Nature intended. And this is all very natural and organic and in tune with mysterious cycles of the cosmos, which believes that there's nothing like millions of years of really frustrating trial and error to give a species moral fiber and, in some cases, backbone.
Terry Pratchett