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pigeons are domesticated rock doves. rock doves nest in small caves, so the only nest building they need to do is a few sticks to prevent eggs from rolling out of the caves.

They were also popular as food, and for use of their excrement as agricultural fertilizer. Probably more so than letter delivery.

My father's family raised pigeons for local restaurants in 1930s California. They were cost-competitive with chicken back before the 1950s-60s chicken breeders shifted the dollars-per-pound growth curve.

Minced-squab (pigeon) with pine-nuts, wrapped in lettuce leaves with plum sauce.

Absolutely delicious when properly prepared.

one of my tomatoes grew almost 20 feet this year entirely off a little bit of pigeon guano, that stuff is crazy as a fertilizer

they were discarded 100 years ago? somehow they are still everywhere

Pigeons are highly adaptable and pretty smart, on top of breeding like hell.