I know that this is hard to believe, but I SWEAR I found an abandoned nest two weeks ago! I know that there is no way that the eggs could have survived the winter, so that means that they had to be new. They had been broken open, probably by predators, and all that was left was the shells. Unfortunately, I didn't have a camera with me at the time, and couldn't make it back to the car and back to the site before dark. Anyone else have similar experiences? Seemed pretty odd to me, but I know what I saw.