A house centipede with joints glowing white under a black light torchlight.
The human eye cannot see ultraviolet light, but insects can.
Entomologists postulate that insects and arthropods (eight-legged creatures) use that visual ability to warn other creatures from coming near because they are venomous, or perhaps their UV markings signal their presence to their members of the opposite sex and make it easier for them to find mating partners.
