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the sounds are very usual :) thats the sounds they make :) and i agree, it is creepy :)

Well, I've only heard of adults pigeons. Something like "Urururur" :)

True, thats the sounds the adults make, the baby pigeons (also as young adults) do these begging sounds asking for food, it comes with a certain motion they do with the wings and they beg and nag for food even when they are full :)