Hi @waltraud , I think this is a bit different to YTBC sign. But on inspection of the real thing, if it is YTBC, it should be possible to see borer sign in the wood inside the damaged area. Or if we do get photos of Krefft's it would be fairly conclusive, I think.
rhyshardy and DonFletcher There have been lots of tool-wielding Yellow-tailed Black Cockatoos recently on Mt Majura.... these omnivorous cockatoos even felled small trees.
I identified this as bird so it would go to bird moderators, one of whom might recognise it,. As there is no 'unknown bird' under the parrot category I chose an implausible species to attract attention.
Hi @Lisa.Jok, A Possum clearly and not Ring Tailed because it has more signs of its partly carnivorous lifestyle, i.e. stronger canine and premolar teeth and a sagittal crest for better attachment of strong jaw muscles. Great photos for skull ID, thanks, except a side view can often be helpful also as well as the main ones you took from above and below, and sometimes even a view from the back of the skull.