I cant really copy the link on my phone but ... no cactus is native to australia only the americas

Ok i got it to work! It looks like some kind of ferocactus ... the one next to it is very much dead and that soil looks VERY bad, rot is immanent o_o get new soil with lots of pebbles and perlite

Micro is correct. All cacti are from the Americas.

Zeck, we gotta talk about your pebbles. We use volcanic pumice or perlite because it's lightweight and porous. So, it holds a little water when it's wet, a little air when it's dry, and doesn't weigh down the pot. Rocks and pebbles only take up space but without the aeration it's dead space.

Well i use volcanic pumice and on the dover of the bag it says volcanic pebble (same thing as volcanic pumice) sorry for the confusion o_o

Oh, me also sorry too, as well;)

-Cookie Monster

Looks very much like an Echinopsis, which is also pretty common in 'not C&S addicted' households.

Jordi