Possums have a "territory " of approx 12 km, and will often do a circuit over 3 or 4 days, thats why it pays to leave your trap at least 3 nights. And they often overlap their terittories, so its not just the resident 1 or 2 possums. They only have to eat once every 3 nights, and if its raining will just hole up until its over. But traps catch in the rain, poison not nearly so much. Best night I had was 19 possums off 20 traps on a miserable NW night when it absolutely pissed down.
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