Darwin devoted a good chunk of The Origin of Species to a discussion of variation in breeds of domestic pigeons. As a photo researcher for a biology textbook publisher, I occasionally had to find photos to illustrate Darwin's work in this area. Dissatisfied with the photos I found with the photo agencies, I decided to try getting my own, and I designed and built a special photo box (basically a small, contained photo studio) for the purpose. In 2016, the Grand National Pigeon Show came to Western Massachusetts, and I got the attached photos, among many others. The last photo (a composite with two different breeds) shows the difference in size between one of the smallest breeds and one of the largest. As with domestic dogs, domestic pigeons are all descended from one species, the same pigeons (technically rock doves, Columba livia) that populate cities around the world.