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There are the infrared critter cams that you can attach to fence posts or trees, which trigger on warmth detected. You can buy them online. I have seen one Bandicoot that seems to live behind my back shed and has a path into the neighbors property. More noisy are the possums that live in the bush beyond my back fence, and their eyes reflect the light from my astro head light. They growl at me from time to time but at least they have never tried to get into the observatory.
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