I don’t understand it either, they replaced mertens water monitor, but they were just moved to a smaller exhibit next door. I’m guessing since the iguana was all ready at the zoo, that they couldn’t find a zoo to take him/her so they put it in here. But they used to be mixed with the zoos pair of goldis monkeys(which now live with a pair of speckled mousebirds) so why move them here? Another hypothesis I have is they moved the monitors to breed since they might not breed well with the kookaburras?(and they could be either both male, both female, or siblings) guess we’ll never know.