Northern Mockingbird Nest Failure

We went to visit the nest after 4 days of not seeing it. I had that bad feeling that the eggs would have been eaten (as has happened with all my nests). It was past 8 pm and I walked up to the nest. The mother wasn’t on it and thought that was a bad sign. I stuck the Canon Powershot EPLH 180 (the smallest of our 3 cameras and easy to hold above a nest) and there were the remands of yolk and shells, there was a shell on the ground under the nest. Why do my nests always get eaten? We heard Blue Jays in the trees nearby so I suspect a Bue Jay.

Eggshell ID needed!

Spotted this eggshell when we were birding, any idea what bird made it?

Cornell Lab of Ornithology

Cornell Lab of Ornithology