Sea Life Color Codes Food to Evade Danger

Crabs feeding from coral, Credit: Sonke Johnsen

Blue emitting plankton drifting past green emitting coral, Credit: Sonke Johnsen

Bioluminescence of a colonial anemone, Credit: Sonke Johnsen

This bottom dwelling colonial anemone Credit: Sonke Johnsen

An example of bioluminescence: light emitted from a deep sea brittle star (Credit: Sonke Johnsen)

Deep sea shrimp spew out chemicals that generate light where they mix in the surrounding currents, Credit: Sonke Johnsen

The Johnson-Sea-Link submersible dives to nearly 1,000 meters. Credit: Sonke Johnsen

The milky way from boat to show sensitivity of camera used to document sea creatures, Credit: Sonke Johnsen

Light emitted from a deep sea brittle star, Credit: Sonke Johnsen

Crabs sit placidly on a sea pen that emits green light, Credit: Sonke Johnse

On the sea floor, scientists collect specimens ranging from a shrimp species that vomits light, to a glow-in-the-dark anemone. Credit: Sonke Johnsen