Like terrifying glow-in-the-dark toys, these animals luminesce at night (humans can see this if we use black lights), thanks to a cuticle that absorbs ultraviolet light reflected from the moon and emits a greenish-blue glow. Their luminescence may be part of a warning system that lets them know when the moonlight is so bright they risk being seen by other predators. It would be good to stay out of the way of those predators, since many of them are other scorpions: a scorpion’s diet is 40 per cent scorpion. The glow may also attract another of the scorpion’s favourite snacks, the moth.
Check out this absolutely stunning Blue Cloud Forest Millipede (Pararhachistes potosinus) found only in the remote high altitude cloud forests of Mexico. The bright blue coloration warns predators about its ability to produce toxic secretions.