I think the coyotes and skunks get the eggs up here, We used to have fair amount of ruffed and sharps on the farm but the last sharps I saw were 3 winters ago. Been about than long since I've heard a ruffed beat off too. We hear coyotes almost every night from all directions, Pups just barking during the day just south of the house someplace . There are so many coyotes that they must be about due for a cruel act of nature.
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Pine martins up here too , They scavenge for eggs in the spring both in trees and on the ground. Curious little buggers.