Very rarely will chickadees invade active bluebird nests, peck the eggs and take the nest over. However, this extremely rare behavior has been reported by bluebirders. All cavity nesting birds can potentially behave like this, but there are ways to protect active nests.
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8 Ultimate Tips for Keeping Peace Between Bluebirds and House Wrens This Nesting Season
If you have a house wren going near your bluebird or chickadee nest box, the first step you can take is to add a second nest box, after that optimizing nest box location, adding a wren guard, keeping the wren busy will help keep the peace between bluebirds and house wrens.
Wren Guards Prevent House Wren Attacks in Your Nest Boxes
The best way to prevent a house wren attack is to add a wren guard to your nest box as soon as the first egg is laid. This prevents possible nest abandonment by the parents since they are more invested in the nest, and prevents wrens discovering the nest hole. It’s very easy to make your own wren guard too.
Chickadee Nest in Your Bluebird House –Take These Steps Immediately
If you found a chickadee nest in your bluebird house, DO NOT remove it. Instead, confirm you actually have a chickadee nest and protect with a 1 1/8-inch hole reducer and baffle. You can also add another bluebird box at least 50 feet or more away.