The thorny devil, named for the sharp spikes that cover its head and body, is a lizard that dwells in the Australian Outback’s hot and arid desert. Though its scary appearance has earned it other equally alarming names like the thorny dragon or the mountain devil, the palm-sized reptile is a harmless, slow-moving animal that has managed to adapt to one of the world’s most inhospitable environments. While researchers know a lot about these hardy lizards, the one mystery that had never been completely solved, is how they keep hydrated.