They might be called the “rats of the sky,” but Charles Darwin certainly saw something in pigeons. It turns out the father of evolution saw in the bird an amazing variety of variation in color, shape and form. Richard Bailey, a photographer based in London, honored the 150th anniversary since the publication of “On the Origin of Species” and the 200th anniversary in 2009 of Charles Darwin’s birth by photographing some of the pigeon breeds that played such an important part in Darwin’s work. ( Related Article: Sequencing the Pigeon Genome