In the wild they tend to build these rickety-ass little nests in places where predators have a hell of a time reaching or noticing, and rely on their chicks to basically build a fortified bunker of poop (most other species clean up but that’s a different topic).

But then humans came along and built enormous vertical monolithic structures everywhere with little eves and outcroppings and the pigeon is now king. Hawks? Cats? Foxes? No biggie

It’s weird to think that if our architectural tendencies leaned towards pyramids we’d probably have a goat problem about as bad, goats just randomly hanging out on the sides of buildings lol