Fireflies have long been a staple of summertime, ordinary insects by day that become dancing sparks of light at night.

Taiwanese spiders exploit firefly bioluminescence as bait, keeping trapped fireflies alive to attract additional prey.

Anecdotal reports say firefly populations are declining. One program hopes to change that, one backyard or park at a time.

At night in the forests of East Asia, fireflies glow to attract mates. But sometimes their signals are hijacked. Sheet web spiders have been caught turning these insects into unwilling accomplices, ...