We've got mosquitos in Brooklyn for sure. The worst are the Tiger Mosquitos as they are out in the day time so you don't have your guard up. I'm not sure they can survive in Duluth but you'll have them some day the way things are going. Sometimes a black bear or coyote will make it across the George Washington bridge which is insane considering that it's the busiest motor bridge in the world. We have opossums and raccoons at work and there are a ton of deer on Long Island. As far as they trees go, since they are in the only holes is an otherwise giant concrete slab all the water goes to them and gets trapped. Also the parks department curates what trees can be planted and what cannot. So in general they a picked because they are hardy, with little care and don't drop fruit (feeding the rats).