Startle this Parapandulus shrimp, and it will spit a glowing cloud in your direction, illuminating you for predators to see.
To produce these van Gogh-like swirls, the shrimp vomits up chemicals that react together to produce light. This particular shrimp was photographed in the Bahamas, during an expedition in the Johnson-Sea-Link submersible near the sea floor. The mission? To poke sea creatures and see if they would glow.
Check out more bioluminescent animals at National Geographic News.
Shrimp photo via by Sönke Johnsen NOAA-OER/National Geographic News
Under normal light, this roach looks normal enough. But under a fluorescent light, its three spots—two large ones and one very tiny one just visible under the right spot—light up like a Christmas tree.
This remarkable species of South American cockroach, Lucihormetica luckae, owes its fluorescence to bacteria. The spots on the dark brown area of its carapace are pits inhabited by microbes that glow under fluorescent light.