Scorpions glow in ultraviolet light

Scorpions also glow under ultraviolet (UV) light. This otherworldly luminescence results from a substance in their exoskeleton called beta-carboline. When exposed to UV rays, they emit a bright blue-green light. Baby scorpions and recently molted ones exhibit this striking fluorescent trait. 

The exact purpose of scorpion bioluminescence remains debated among experts. Some researchers suggest that the glow may protect them from the harmful UV radiation in sunlight. Field observations have also led scientists to believe that fluorescence could play a part in hunting, luring, or disorienting prey. Finally, the glow might also be a signal or identifier among scorpions.