We've had the collared doves here for years. I first noticed the plague they can become when our little town went through a gentrification of our downtown in a project known a 'street-scaping' where sidewalks were dug up and replaced with brick pavers with landscape trees planted every few yards.
The collared doves moved in, displacing the pigeons in the process and began a colonial roosting program in the bushy little trees. You did not dare park your car under a tree after dark on a visit to one of the new bistros in the downtown area.
I feed the birds in my back yard and have noticed that when the collared birds move onto the feed, the mourners move out...Geo
