They say the way to test whether you have rats in your roof or possums is to place an apple there. If you find it chewed, it’s rats, if it’s taken, it’s a possum.
But I’m afraid that when I check back, the apple will have been carved by talons into a leering jack-o'-lantern.
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@gregeganSF Exterminator here. I don't know for sure about your possums, but our North American opossums don't typically invade roofs. It can happen, but it isn't common. Maybe your marsupials have a wider variety of behaviors, so my advice may be pointless. Either way, I suggest calling a pro.
