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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. E

    Ideal drill bit for entrance holes

    A hole 1.5" in diameter does keep out starlings, but is a welcome mat for house sparrows eager to take over the box. They do kill nestlings as well as adults in the box. There are lots of Bluebird support sites, best known is Sialis Home - Helping Bluebirds and Other Small Cavity Nesters...
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