It is a great habitat, but in recent years this has become a slightly odd exhibit with 3 rodent species from very different parts of the Americas.
This was the original 'Beaver Country' exhibit that won the first UFAW exhibit award back in 1987 when it was opened. The near part of the photo, including the small pond, was a 'Marsh Garden' when the exhibit was opened, and the beaver enclosure was extended into this area a few years later. Canadian beavers bred in this exhibit, in the artificially-constructed lodge in the centre of the photo. The apex-roofed shed to the right of the photo was built around 1995, after a fundraising effort where visitors could 'sponsor a log', and was a museum-style representation of 'Grey Owl's cabin, the British man who naturalised in Canada as a native American and campaigned on their behalf.
The aviary has since been added onto the back and I think this is now an enclosure for Geoffroy's Marmosets (other photos in the gallery show the inside of the log cabin with the marmosets in there).
The problem with the exhibit was that the beavers would rarely show themselves, and so when the current owners took over they added in two capybara. The two Mara (one is visible in the very centre of the photo) were added after the Wallaby enclosure they had been staying in was redeveloped as the lemur walk-through. Previous to being kept there, a large breeding group of maras was kept adjacent to the beaver exhibit on what is now the site of the gibbon cage.
I think the park missed a trick and could have created underwater viewing and mirrored viewing into the beaver's lodge, which has in some zoos created an amazing visitor experience. However, the beavers still have an exceptional habitat and a huge amount of privacy. Ironically, I remember seeing beavers at chessington and Beaver Water World in very poor enclosures, and these animals were always extremely active.
