Are these feral deer?
I didn't think there were native wild deer down under,..never heard of marsupial deer either.
Yes right on, no native deer down under - these are feral deer ,existing in/around our farms (in the more remote hills/valleys) in the wild for many generations - according to my 94yr old grandfather at least since the 1930's.
We see mostly Red deer which seem to have more of a herd/pack instinct when they come down onto the pastures in winter, & there is also a similar large population around us of the much less visible Sambar deer.
The Sambars are generally in smaller groups or solitary, and whilst all deer are "flighty" the Sambars are extremely shy/far more reluctant for any human encounter/observation usually staying well concealed wherever possible in heavy timber/bush cover & make themselves scarce the moment they sense/smell people around.
The Sambar stags are @ c.150cm+ (50inches?) at the shoulder & at a guess weigh c.240kgs+ (530lbs ? ), are aggressive if cornered (as has happened by our dogs a few times) & make a defensive sound that once heard will never be forgotten (absolutely deafening at mega decibels that rattles your brain, like a cross between an air horn & a squealing pig - as a kid scared the hell out of me & makes most dogs retreat for cover).
All good venison.