They feed on bramble, rose (and the rest of that family) as well, yes they are australian. It's my opinion that they do NEED eucalyptus though, at least occasionally. It's easy enough to get in most flower shops, they use it fresh to decorate bouquets etc. Got a small tree in greenhouse which will be useful in a year or two, but don't want to strip any leaves off of it until more shoots are growing.
They sometimes lay more than 15 eggs, sometimes less per day, but you can be sure if you look across the bottom (use white paper as a substrate) every evening and if you've got a mated female, there'll be plenty of eggs there. This carried on most of her adult life, but I dont have much to go on as far as how long females live as there's not much known about them and this pair was my first. The other female was never mated as the male died early. But still, plenty of eggs still incubating and plenty hatching so it shouldnt be long before I get more on the go.