brown-headed cowbird egg

We get lots of them here too. They try & squeeze through the holes in the bluebird boxes but thankfully they don't manage to fit through. I did find a cowbird egg in a titmouse nest recently though http://www.projectnoah.org/spottings/7087796

Good picture! Nice contrast between the two eggs. It's probably wrong of me, but I hate cowbirds. They always come and hang around while the Bullock's Orioles are nesting here. Luckily, Bullock's Orioles are one of the few birds who spot the cowbird eggs then puncture them and discard them from the nest.

Thanks for showing us!

Yes, the brown egg is definitely a cowbird egg.