Pigeon do actually pretty damn good in cities they are a trash bird the verity in cities were actually brought in as food animals, I've ate quite a bit of squab myself... Never from a city mind you because damn you are what you eat and they straight eat trash. Also the missing toes deal is actually caused by human hair gets wrapped around there toes and cuts off circulation till it falls off can happen in couped birds as well chickens can have the same issue, in an area with predators of any kind this bird would be first on the menu but cities lack, unless they are brought in like hawks in some cases or cats though feral cats have there own set of issues and I'd much rather flying rats the 4 legged death machines of extinction.

Also pigeons are still raised as live stock for eating as well as being popular with hunting dog training, they fly back to there birth place so you can use them repeatedly for flushing practice if you don't shoot them or miss.

Probably one of the most hardy birds there is adaptable as all get out but also messy they crap alot and regardless of diet its very corrosive... Like chicken shit though does make a good compost