Great job getting rid of those cowbirds. We don’t see that many but we do our best to scare them off, blue Jay’s and wrens too. Wrens have been a problem here destroying bluebird nests with eggs in them.
I hate those darn things and shoot them whenever I get the chance.
Approx. four or five years ago, I was watching a family of chickadee chicks one by one leave their nest box. Late in the afternoon when I thought all the babies had left the nest, I saw a bluejay on the nest box with his head in the box. I chased it off and didn't give a thought to it until two days later when I went out to clean out the box.
What I found was a final chick, dead with its eyes pecked out by that damn blue jay.
Since that day, blue jays have been number one on my hit list.....