Fluorescence is uncommon but widespread in some groups, such as fish (Sparks et al., 2014), insects (Olofsson et al., 2010; Marshall and Johnsen, 2017), and arachnids (Kloock et al., 2010; Gaffin et al., 2012).
While fluorescence has been studied for over a century in birds (Arnold et al., 2002) and scorpions (Stahnke, 1972), it was first reported rather late in reptiles, in 1971 (Hulse, 1971). Since then, it has been discovered in a variety of other tetrapods, including parrots (Hausmann et al., 2003), sea turtles (Gruber and Sparks, 2015), and amphibians (Taboada et al., 2017).