Had a mate who bought a house near a national park about 4 years age & of course his SHMBO wanted the fire place opened so she could have open fires, so he removed the cover off the top of the chimney, couple of nights later much noise etc possum had come down said chimney into lounge room , was finally chased outside but to this day some of the little soot markes still remain, BTW chimney is again sealed:D
On the other hand my SHMBO bought me a pet possum who lives on the front verandah and is no problem at all:rolleyes:
Rgds