Nigel Cattlin / Field woodrush (Luzula campestris) flower spike. Berkshire, England, UK. April.

Nick Upton / Field wood-rush (Luzula campestris) flowering in grassland, Mendip Hills, Somerset, UK, April.

Bruno D'Amicis / Fireflies (Luciola sp.) males displaying at dusk over a wheat field. Abruzzo, Italy.

Hiroya Minakuchi / Japanese Firefly (Luciola parvula) group flying in forest, Ehime, Japan

Hiroya Minakuchi / Japanese Firefly (Luciola cruciata) group flying along river at night, Shikoku, Japan

Hiroya Minakuchi / Japanese Firefly (Luciola cruciata) group flying along river at night, Shikoku, Japan

Hiroya Minakuchi / Japanese Firefly (Luciola cruciata) group flying along river at night, Shikoku, Japan

Hiroya Minakuchi / Japanese Firefly (Luciola cruciata) group lighting up at night in forest, Shikoku, Japan

Hiroya Minakuchi / Japanese Firefly (Luciola cruciata) group lighting up at night near river, Shikoku, Japan

Yukihiro Fukuda / Light trails of Japanese fireflies (Luciola cruciata) at night, Ichikawa-river, Asago, Hyougo, Japan, July

Yukihiro Fukuda / Light trails of Japanese fireflies (Hotaria parvula and Luciola cruciata), Nichinan-chou, Tottori, Japan, July, Endemic species.

Yukihiro Fukuda / Light trails of Japanese fireflies (Hotaria parvula) Nichinan-chou, Tottori, Japan, July, Endemic species.