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Bioluminescence: Animals & Organisms That Glow

Tap an organism to see where and why it glows.

Fireflies

Habitat: wetlands and forests worldwide. Produce light through a chemical reaction (luciferin reacting with the enzyme luciferase) in their abdomen, used as a signal to attract mates.

Anglerfish

Habitat: the deep sea. A deep-sea fish that uses a glowing lure on its head to attract prey β€” the light actually comes from symbiotic bioluminescent bacteria.

Dinoflagellates (Plankton)

Habitat: oceans worldwide. Microscopic plankton that glow blue when waves or water are disturbed β€” the source of the shimmering "sea sparkle" seen on some night beaches.

Glow Worms

Habitat: New Zealand's Waitomo Caves and similar sites. Larvae that hang from cave ceilings and emit a blue glow, creating a starlit-sky-like spectacle that has become a famous tourist attraction.

Jellyfish (e.g. Aequorea)

Habitat: oceans worldwide. Jellyfish carrying green fluorescent protein (GFP) have made a major contribution to science β€” GFP is now widely used as a fluorescent marker in life-science research.

Glowing Fungi

Habitat: tropical and subtropical forests. Certain mushroom species emit a soft green glow in dark forests, believed to help attract insects that then spread their spores.

How does bioluminescence work?

Bioluminescence is a chemical reaction in which a substance called luciferin reacts with an enzyme, luciferase, to produce light. Because it generates almost no heat, it is sometimes called "cold light," and organisms use it for a range of purposes β€” attracting mates, luring prey, and warding off predators.

What's the science behind glowing proteins?

Jellyfish carrying green fluorescent protein (GFP) made a major contribution to science β€” GFP is now widely used as a fluorescent marker in life-science research, including genetically engineered fluorescent lab animals developed for scientific study.

Frequently Asked Questions

Can humans produce bioluminescence?

Most vertebrates, including humans, have no natural bioluminescent ability, though fluorescent lab animals engineered using jellyfish GFP genes have been created for scientific research.

Can glowing ocean water be seen anywhere?

It is only observed at specific times and places where bioluminescent plankton bloom in large numbers, typically seasonal and limited to certain coastlines with low pollution and the right conditions.