Hi HelenCross, thanks for your sighting. The media you provided is missing or unclear. To help us verify this sighting, please provide additional media.
Oh thanks and sorry- this one was a bit random but i couldn't resist picking those leaves. The leave are now soaking and are giving off a yellow colour dye.
I can't say from the photos which species; probably not a local Eucalyptus. Decades ago several Eucalyptus species that are not local were planted around the Hackett water tank, I think in order to test which one is suitable to re-timber Mt Majura which has been cleared for sheep and cattle farming and timber collection. At that time it seems that there wasn't a concern whether species was local or not. The branch could have been fallen / blown from any of those planted not local trees. To see Mt Majura's local trees visit https://www.flickr.com/photos/61627737@N03/albums/72157627244893256/