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Female glow worm on heather. Arne, Dorset, UK. Side-lit with an LED torch. The most efficient LED only converts 22% of energy into light, whereas the glow worm manages close to 100%.

Female glow worm (Lampyris noctiluca). Arne, Dorset, UK. 30 second exposure showing abdominal movement. The females occasionally waggle their brightly lit bottoms like this to attract a mate. It also works on passing photographers. Self-illuminated.

Female glow worm (Lampyris noctiluca). Arne, Dorset, UK. Additional backlighting using an LED torch. This one's for Michael!