Bazman's place is fabulous! The swale system is brilliant. And the biochar stuff is very interesting. As for the koalas, from what I have been told, they travel within a 10 hectare area. They have their favourite trees and from my own observation they come around my place and go from one favourite tree to another for about a week and then they move on and come back in a couple of months. Individual koalas seem to have their favourites. I watched a mother and her baby for ages. Then she now longer carried the baby but they stayed in the same tree (she was probably still keeping on eye on it) and then they parted company. I've been told also that the baby will visit the same tree that the mum has taught it to feed from as a youngun as time goes on. I believe I have seen both of them at different times in the same trees as they were in as mum and bub. A smaller female, sits in her favourite trees till she gets to a euc. overhanging the clothes line and then I don't see her for a while. I have quite a large koala population (see one nearly everyday, although there are not as many as years ago I've been told) here as most of the properties around have left the trees in place and so it provides lots of food. I'm lucky that from my verandah it looks straight into the trees so the koala viewing and spotting is very easy.