Scientists at Tunghai University, Taiwan, now have evidence of spiders using the bioluminescent light emitted by captured fireflies to attract additional prey. According to a statement detailing the unusual arachnid behavior, some sit-and-wait predators such as anglerfish use bioluminescence to attract prey. However, the team’s new findings are the first documented evidence of sheet web spiders (Psechrus clavis) using the bioluminescence of another species to their predatory advantage. Like most firefly species, the winter firefly emits light flashes to attract a mate. They were, however, surprised to witness the spiders leaving trapped fireflies untouched for up to an hour until they had stopped emitting light.