Cheers for the tip Watto! Will keep an eye out for 'em.....
.... and now for the QI part of this thread:
According to wiki, the name "kangaroo apple" is used for a number of species (within the Genus "Solanum"), but the main two are S.laciniatum and S.aviculare.
And it's not just the Sambar who have a hankering for them; apparently the Russians and the Hungarians are growing kangaroo apple to get their hands on the toxic alkaloid "solasodine" which is found in the unripe fruit and leaves of S.aviculare, which they then use as a base material for making steroid contraceptives.
So there you go folks, the Aussie native wildlife (or at least it's by-products), is at hand and looking after you in more ways than you might suspect; for instance in "the pill" in some hot Hungarian or Ukrainian chick's purse that you might be trying to tune next time you find yourself in a pub in Budapest or Kiev.
In other news, kangaroo apples can also make a half-decent chutney (when cooked up properly to stop them giving you a guts-ache), and weirdly enough, are also used as a rootstock for grafting eggplant.