Blind dinosaurs, the Night Stalker is a very angry predator. It feasts off of other creatures and cannot be used as a pet because of their hostile nature. Much like a bat, they use sonar to navigate around their environment. Blaire (NPC) claims to have had a friend who attempted to domesticate one as a pet but was eaten for breakfast the very next day.
The Night Stalker would later appear in Eliatopia. Interestingly, unlike HH Night Stalkers, Eliatopian Night Stalkers are barely evil, instead being mostly hungry. They're also made nocturnal to reflect on their original setting.