Sorry I am not Hix, but this is the enclosure for pygmy blue-tongues. For a while only a male was kept in here but I'm not too sure how many are in there, as there are quite a few behind-the-scenes. When looking at this exhibit usually only the heads of the pygmy blue-tongues are poking out as they would be in the wild, waiting for food.
Many people who have a look at the exhibit see nothing and move on but if you sit and watch one may pop it's head out.