Hi, many times I've come across snaking mounds around the sides of hills. They look like they're hand dug. I'm assuming they're something to do with water and maybe keeping it off the lower areas where miners were digging. I don't really know. On a different note. I got whacked hard twice on the back of the head out near Castlemaine by an insect that was obviously territorial. I've spent a lot of time in the bush and the March flies normally buzz around and land and look for a place to bite but this was an instant bite, something different. Bloody hurt and raised bumps but the pain subsided after about an hr. Thought a wasp but it was only one. Any ideas?