Deep in Taiwan’s forests, researchers uncovered a chilling hunting tactic: sheet web spiders don’t immediately devour fireflies caught in their webs. Fireflies as Glowing BaitEcologists have discovered that a nocturnal spider uses the glow of trapped fireflies to draw in new prey. They placed LED lights that mimicked firefly signals in real spider webs, while keeping other webs untouched for comparison. The sheet web spider Psechrus clavis is a nocturnal sit-and-wait predator found in subtropical forests of East Asia. Video footage captured by the researchers in their experiment shows sheet web spiders employing different strategies when interacting with different prey species.