American Robin nests are the easiest to see, not least because there are so many of them. 
This one was in Inwood Hill Park. When we walked by again coming down the hill, it wasn’t filled by the parent bird. Sometimes the birds will dart off, but that does leave the eggs vulnerable. The day before we watched as three Crows each took a turn eating the eggs in a high nest in Prospect Park. A bit of blue egg was seen. Other thrushes have blue eggs, so it may not have been a Robin, but it probably was.
So Crows are notorious for raiding nests, but their reputation here is much overblown. This may surprise you, but this species actually takes more bird eggs than Crows: 
Yes, the adorable Eastern Chipmunk. Which just goes to show you that moral views of nature should always be suspect.
Thanks for that last sentence – thinking about feral cat colonies again.