>>11295
Absolutely retarded, trees are nice (to look, climb, etc.) and there's more life there beyond pigeons.
Just exterminate them if they're being a problem, it's not that hard. Give BB guns to kids and pay them per bag of dead pigeon or implement some fancy technological solution.
I've been thinking about urban ecology lately and believe it holds a lot potential, we can fill cities with life forcefully evolved to our benefit; garbage cleaning birds, living sewers, bioluminescent flora, peretually clean pools, discrete diagnostician-insects… Flesh is such a wonderful material!
Picture is a mutualist plant that feeds bats and shrew with nectar from that tip, eating their shit in exchange.