It has struck me that pigeons can vary enormously, even to my untrained eye. This was brought home to me as I strolled from Grovsner Square to Berkely Square - those who know London will know these places, but suffice to say they are only a few hundred yards apart. At the former, however, the pigeons are distinctly dark, indeed some are practically black. At the latter they are a very light shade of grey.
So I wonder: Do pigeons tend to stick together in flocks, as this would suggest? Or is it all in my imagination, and there is considerable… diffusion… declining pigeon entropy… amongst the London prison population?