Bioluminescent Bacteria: Milky Sea

At a bioluminescent web site, "milky seas" are discussed. This is where bioluminescent bacteria in the trillion-billions and beyonds cluster together and can actually be seen from space. (See blue streak next to Ethiopia in picture above). These are miles across and dozens - maybe hundreds of miles long.

This makes them - in aggregate - one of the largest organisms on Earth.

This is even mentioned in Jules Verne's 20,000 leagues under the sea.

By the way, the bright streaks are the glowing lights of cities in tis area of the world - i.e. light pollution.

Bioluminecence (alt. sp. Biolumenescence)

Fireflies. We call them lightning bugs. They are not the only creatures who employ "luceferin" and "ATP" to generate light. Each species of lightning bug has its own morse code signal, and when you stand in a field on a summer night, the firework display is spectacualar.

Maybe you are old enough to recall collecting and selling the fireflies for "scientific research"?

A full article on this weird effect is in comment 1 below.