I am happy to take critisism don't worry, i'm the first to admit i'm wrong. What i'm basing my judgement on is from what i've seen while working in these zoos on exchanges. I'm in marine mammals mainly, so my hippo knowledge ain't as much as my marine mammals knowledge, but there are some big time issues in terms of zoo's attitudes towards the mega-fauna. As in most zoo's and zoo visitors and zoo staff i've spoken to expect to see elephants, hippo, rhino and so on, despite the fact that to keep them the majority of zoo's keep them in facilities not really suited to the animals, including social grouping. I'm not passing judgement saying australia's amazing, cause australian zoo's are loaded with problems of their own. However in terms of management of the same species, it's not just Australia but European zoo's are building very high quality hippo habitats for social groupings. It's just simply the way it is.