Do they tend to live their lives in one area of the city or do they move around? For example, do pigeons born on London's Trafalgar Square live their whole lives centered around Trafalgar Square or can they move and become Marble Arch based pigeons?
What is the typical range of a city pigeon? Have Trafalgar Square pigeons ever made the trip to Buckingham palace just down the road from them, or do they hang out in the square all the time?
How different are these behaviors from their wild behaviors and how effected by humans actions in the city are they? For example, do pigeons learn that a particular city square will become busy with tourists in the summer and travel there at these times of the year seeking food?