On his first night in the Grove, Larry couldn’t sleep a wink. In the middle of the night, he woke up to a noise in the bushes around the camp. Were they footsteps? Was that a growl? He frantically started to flip through his knowledge of the known animal life in the Grove? It could have been anything from a mouse or the fearsome bear. It would have been rather dumb to be kept awake all night by the scrabbling of a rodent… but would he know to run in case it was a bear? When morning came, he knew he had to make a sort of animal trap – not to catch the creature but detect its presence by the sound it made. It’d ignore harmless ones like rabbits or mice, but would take notice of anything bigger like a wild dog or bear. And if the beastie was loud enough to trigger the trap, it’d wake Larry up, giving him enough time to run for his life.