Thanks for all the helpful responses to my request - from well over 20 individuals. Please excuse me for not acknowledging each individually. The responses have drawn attention to the role of bridges and overpasses
throughout the suburbs, of which there are probably hundreds suitable for occupation by pigeons. On the other hand, some types of structure have no ledges or apertures at all. I had a look at Tuggeranong this morning and particularly noted the pedestrian
walkway over Erindale Drive. This harboured 2 kinds of tenants (below).
One other thing. If anyone has any local information on the proportions of the different colour variations over time, I’d be very interested to hear about that.
