Darling, you look positively fluorescent today

Budgies fluoresce to appear more sexually attractive

source: New Scientist January 12 2002 p22

A team from the University of Queensland, Australia, has carried out research on budgies which shows that fluorescent pigments can be used as a way of signalling sexual attractiveness. The budgies’ yellow cheek and crown feathers were smeared with UV-block to dampen fluorescence, without altering colour. Control birds just had petroleum jelly smeared on them, and this is not a UV light blocker. Female and male budgies were found to prefer mates with a fluorescent glow. This research was reported in Science, vol 295, p92.