Glowworms v Fireflies
Did you know that glowworms glow green and fireflies glow yellow? And both are beetles. Radio 4 has a fascinating littntary about bioluminenscence and nature's "lamp of love" - part of a series called Nature's Magic, which also covers glowing jellyfish, electric rays and flies' eyes. Listen again here. Thanks to Speechification for pointing the way to the BBC nature department's impressive archive.