Squirrels will kill adult birds at feeders also. When I lived around them I had squirrel baffles on the poles and all my feeders had grids. My platform feeder had a 1" grid over it also to keep out the starlings and cowbirds that bully the song birds. Keeping the feeders and birdhouses quite far from fences and trees helps also. Squirrels can jump really far. I have a friend who calls them flying rats. I also had a clear dome over one niger feeder. It's a lot of paraphernalia but I felt like I had to protect them if I was going to lure birds to the feeders. Here we have trouble with hawks that sit on the fence and wait for the quail and small birds to get distracted. There's kind of a downside to feeders and bird baths I guess. Birdhouses are easier to protect. Sounds like you have a good plan for the houses. So nice that you are looking out for the babies.

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LoL, cute story. They are fascinating to watch for sure. I have been seeing squirrels trying to dig up my newly planted vegetable seeds, and for some reason this year, they are leaving holes all over the yard where they've dug up another crocus bulb to eat. Glad you figured out who was working over your hostas. :-)

In my experience, squirrels can defeat most feeders. The tube feeders you mention work sometimes until the squirrel finds a place where his teeth can reach some small portion of the plastic. Even the metal pole mounted box feeders guaranteed squirrel proof are not. I've seen my squirrels sit on the top and hang over the edge to pick seeds from the tray without tripping the weighted perch. The baffles that mount above the hanging feeders are only temporarily effective. Post mounted feeders set away (11-feet) from anything are the most effective. The post baffle needs to be 5.5-feet high and the feeder cannot hang lower than 5.5-feet. My dad uses safflower seed and hangs his feeders high on a post with a big baffle. This works most of the time for him. He gets doves and cardinals mostly with the safflower. The big birds can sit on his seed savers. I use a metal post with a baffle and (fingers crossed) so far it works fine. I even have a platform feeder hanging on mine. BUT, I have a crazy border collie running amuck thru the yard keeping the squirrels treed. Good luck, those little devils really take a lot of fun out of bird feeding.