Animals shown in the main gallery include barramundi , catfish , mullet , goanna , snake-necked turtle , pig-nosed turtle , Rock-haunting Ringtail Possum , and wallaby and thylacine ( Tasmanian Tiger ) . Animals depicted in the main gallery include barramundi , catfish , mullet , goanna , snake-necked turtle , pig-nosed turtle , Rock-haunting Ringtail Possum , and wallaby and thylacine ( Tasmanian Tiger ) .