Feral Pigeons

Try large: their plumage really is beautiful...
Another "Familiarity breeds contempt" blip...

Feral pigeons are members of the species Columba livia: they are rock doves, but are known as feral pigeons (or domesticated pigeons when thoroughbred and tagged in captivity) because rock doves have been domesticated over many thousands of years and the feral populations of pigeons found worldwide are the result of many successive escapes from captivity which have since become established as the common pigeons that we know and love...
Rock doves were the first birds that humans domesticated: the earliest known record of their domestication comes from Mesopotamia more than 5000 years ago. They have been domesticated for many various purposes: originally they were domesticated for eating, but they have since also been bred for exhibition, and for sport and flying.

Feral pigeons are very much more variable than rock doves: their plumage ranges from indistinguishable from their (truly) wild relatives, to the almost entirely white, brown, or black ones which are a fairly common sight around London.
Rock doves themselves are now relatively scarce; they will breed freely with feral pigeons (so, by definition, are the same species...) which means that gradually the wild parents species is becoming continuous with the populations that have become wild after generations of domestication.

I've tagged this BlipBigYear, but am not sure how Anth will approach the problem of whether feral pigeons represent wild Rock doves... These are genuinely wild birds, and indisputably members of the species Columba livia.

Either way, I think that they are beautiful (when they're clean and intact). It is easy to be put off by the fact that in many places they are over-abundant pests, but really (when seen as individuals) they can be beautiful with intricate plumage and wonderfully vivid iridescent necks.

p.s. I was saddened to discover that the Mount Pond swan family have moved on: I visited all four of my regular ponds this afternoon to try to find them, but they've moved elsewhere.