WHAT IN THE WORLD?!?

I found this egg underneath a bush nest to my grandparents feeders. As many birds were feeding there, I can’t be sure which laid it. It is a bit larger than a penny—white with brown speckles. What species is the egg and HOW IN THE WORLD did it get there? Surely the mom wouldn’t have laid an egg on bare ground….

Territorial Aggression?

4/7/2021— This Tufted Titmouse woke me up at 8:00 AM to loud chirping and banging outside my window.
Recently, I put out a nest box on my window sill. In case my presence would deter birds from nesting in it, I applied 1-way window-film. Unfortunately, it blocks sunshine from entering my room and it’s reflective on the outside.
I believe this Titmouse was attacking his reflection, thinking it was a rival bird. (I decided to name him “Ansel,” which means “protecter.”)
I drew highlighter on the window to get him to stop, but he hasn’t come back yet so I’m not sure whether it worked or not.
I do have a bird feeder on my windowsill as well, but, since Tufted Titmouse nesting season is beginning, I figured it was probably more likely he was attacking things to protect his nesting territory or claim a new one.
Will birds attack anywhere on their territory or only near their nest? Does he want my new birdhouse?

Cornell Lab of Ornithology

Cornell Lab of Ornithology