Babirusa don't dig, apparently. Their snouts aren't adapted for churning up the ground unless it is muddy (i.e. they do wallow), and in the wild they feed off the ground not by digging up the ground. So in theory all Babirusa enclosures should be able to be kept green, except in the area given over to a wallow. I've only seen Babirusa in Asian zoos though, and they are always in bare enclosures.The Golden Swan for best swine exhibit goes to… Chester Zoo. I was leaning towards skipping this category altogether. It is so rare to see a pig exhibit that isn’t simply a patch of mud, and it’s hard to single out one mud patch as better than another mud patch. Then I went to Chester, where they somehow manage to maintain greenery in with their babirusa, not once but twice. Although, I admit that I remain ever so slightly suspicious, since I didn’t actually see a barbirusa. I’m just taking it on trust that they are really there, living in their miraculously grassy enclosures.