Most disgusting display

Been to the Auckland Museum during my trip to New Zealand last year. Its a pretty good museum with lots of displays from natural history to Maori culture and a war memorial (huh, NZ in war? Not quite, but they sent their people to join the British, duh).

And in that museum, I've come across the most disgusting display I've ever seen! Its around the natural history galleries, in the section called "Weird and Wonderful". There is a tank.... well, let the picture speak for itself.