Birds & glowing fireflies.
Diogenes Jack-O-Lantern?
Foxfire on old stump

"We first noticed the effect in birds and spiders more than 20 years ago. Birds that eat just about any other insect will reject fireflies of the genus Photinus and the reason is their highly toxic self-defense compounds that we named lucibufagins," says Thomas Eisner

http://www.news.cornell.edu/releases/July99/firefly_lizard.hrs.html