When we lived in Buffalo (MN, not NY lol) the Monarch's would migrate through our backyard each year. There was a clearing between a row of shrubs/trees and the creek... you could stand there and actually HEAR them :) Well, it's been a lot of years since I've been able to experience anything quite like that.
Today, Tim came back in the house before leaving for work and said, "I left the three big milkweed next to the shed because I was told Monarch's like them. I looked at them this morning and didn't think they looked like they were doing too well." Two of them were completely STRIPPED of their leaves, and the other was well on it's way. Apparently Tim heard right... Monarch's do like milkweed (or at least they do in the caterpillar form!)