Nature's light display
A BBC film crew has demonstrated how ostracods use bioluminescent light to make predators spit them out.
Ostracods - small crustaceans - were put in a tank containing cardinal fish, which eat plankton.
When an ostracod is swallowed, they emit a burst of light making the cardinal fish spit it out.
The ostracods use bioluminescence to illuminate when threatened, the light deters predators who do not want to be seen.
In this clip, physicist and BBC presenter Helen Czerski witnesses this defence mechanism and said: "It's like a little fish firework."
Read more: Fish filmed spitting ostracod 'fireworks'
Super Senses: The Secret Power of Animals starts on BBC Two at 21:00 BST on Tuesday 19 August (BBC/BBC America coproduction).