I've noticed over the years that Bella (the mum possum here) goes through stages of having cuts and scratches all over her.  I used to think it was the naughty boy possums scratching her during mating..........but I'm now pretty sure it is from her baby's claws when clinging onto her back.  She's pretty gouged up at the moment and baby is at the 'riding on her back most of the time' stage.

Still trying to get a photo of the baby but the last few nights they have been waiting until nearly dark to come down for dinner. Almost like they know☺️