A Tiger Snake was observed by Peter Kelly in the home garden on his Creek Junction property -photo. The animal was about 1.4 m long and had distinctive banding. A second, smaller Tiger Snake was observed later the same day closer to the house and , the following day, in the wood pile.
Gall caused by a rust fungus, about 10cm across, on a large Acacia Mearnsii.
Update: Uromycladium tepperianum has been split into at least 16 different species each infecting a different range of Acacia species. The one on Acacia mearnsii is called Uromycladium murphyi. See "Diversity of gall-forming rusts (Uromycladium, Pucciniales) on Acacia in Australia" by C. Doungsa-ard et al, Persoonia vol. 40, 2018 pages 221–238.