“Not long ago, there were only thought to be six thousand bird species on earth. Ten years from now, most ornithologists believe, there will be three times that many. It isn’t that new species are evolving; rather, scientists are arriving at new definitions of what species are. This advanced thinking – and birds are on the cutting edge of it – has profound implications for human understanding. Speciation is evolution. Evolution is at the heart of who we are, what life is on this planet.”