Waltraud I think we will end up assigning something like a "conservation value" across all species and members will be rewarded/recognised by reporting things with a higher conservation value/importance. It will then self regulate because people will get sick of reporting 100 kangaroos if they aren't earning any reputation or badges for the efforts etc. But sure we'll get a few kangaroos still I'm sure. We are finding though in general that as people learn more and get hooked, they move onto more interesting/rare/important species.
thanks for your comment Aaron I too will upload a couple (promise!) of roo photos together with photos that show the impact the overabundant herbivore has on the critically endangered grassy woodland.
it is not only the indigofera and orchids that are affected by overgrazing. we lost native carrots, blue devils, blue bells and many other wildflower species which would make up the rich diverse grassy part of the endangered grassy woodland. It is devastating! the latest victim I noticed are Bulbine lilies, see for instance https://farm1.staticflickr.com/496/20028559228_51e0748f98_b.jpg. I could not believe my eyes when i saw how heavy they we are grazed probably because the land is flogged and not much else left.
And when you lose the groundcover vegetation, you also lose many of the invertebrates, and this affects the larger animals such as birds which feed on them.