The centre is developing a wetland area, where there is a constant struggle against the aggressive, introduced mallard. These fish live in the shallow, fast flowing water. I saw two of them gang up on a curious mallard. They bit it, under the tail, and it gradually moved off their patch and eventually was chased into flying away altogether.
It's a great place to visit. There are kiwi, kept in a reversed house, so they come out to be seen, thinking it's dark. More of the toatara we saw in Invercargill, a small grove of Californian sequoia and much more. (The redwoods were part of a failed programme to introduce exotics to replace the slow-growing native hardwoods, but they look magnificent.)