Parrots will fluoresce for sex

A budgerigar’s head literally glows for its mate, and both males and females of this parrot species prefer to court radiant partners.

Only birds in the parrot family have feathers that fluoresce, explains Kathryn E. Arnold of the University of Glasgow in Scotland. For example, the crest of a cockatoo absorbs ultraviolet (UV) light and reemits it at longer wavelengths that birds and people can see.