Bird Ready(TM) Live and Dried Mealworms

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Portal Guard

That round metal guard around the birdhouse hole is called a portal guard or portal protector. They come various sizes. The one shown is for bluebirds and is 1 1/2″ in diameter. The object of the guard is to keep animals such as squirrels from enlarging the hole and thus endangering the chicks. They’re easy to put on and every wild bird store will carry them.
Bluebird house with portal guard

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