From sea sparkles to fireflies: Chasing Australia's 'big four'

In Australia's Illawarra region, a ghostbusting-style night tour reveals ghost fungi, sea sparkles and tiny creatures lighting up the dark.

On a slate-black night, I stare at a horizon freckled with stars. Only this isn't the sky, illuminated by hundreds of constellations; it's the muddy bank of a river, charged by a colony of glow worms.

"This is my TV," says David Finlay. "It's magical, like something out of Avatar." By day, Finlay works as a transport manager, but by night, he scours Australia's bushland and beaches chasing living light. "If you're tucked up at home, you miss these things. Everybody cocoons themselves at night, whereas I think, what fun can I have":[]}