Our resident zoologist John Sloggett has just had a paper published in the journal Current Zoology (https://academic.oup.com/cz/article/64/3/319/4979555) about the fluorescent properties of geckos. Last year on his holidays in South Africa John was using an ultraviolet torch in the dark to look for scorpions, which fluoresce strongly under UV. He didn’t find any scorpions but instead found that geckos living on the walls of the building he was examining did! The fluorescence is strongest in the head and probably comes from the bones of the skull. “Geckos have exceptional night vision and some can even see colour in the dark, so it may be that natural levels of fluorescence are used for signalling to other members of the same species” he said.