I don’t know for sure, but I suspect ‘they’ give the pigeons something to eat here that makes them infertile and stupid.  There are not nearly as many pigeons around as you would expect in a town that has one outdoor cafe after another, and the ones that are here are sluggish.  Often they can’t get out of the road in time and end up being squashed.  Look at this poor guy – he didn’t have the oom-pah-pah to fly away when I approached to take his picture.  If he can’t escape from a prying camera it’s a good bet he’s not going to be helping to make any baby pigeons…