1. Jellyfish

According to scientists, the jellyfish is the most bioluminescent creature on the planet. Approximately half of the 2,000 species emit some type of glowing capability. 

The main reason why jellyfish use their light is to get rid of predators. There are jellyfish that release bright flashes to escape from carnivores, while others do this just because they want to.

2. Angler Fish

Besides looking like an angry and terrifying predator, the angler fish also has an impressive bioluminescent organ. These animals are named after their nature of predation, in which a reshaped luminescent fin ray has the role of a lure for other fish.

According to several sources, animals are attracted by the light the angler fish release, which makes them fall into the trap. In addition to that, the light helps females find convenient partners in the dark waters of the ocean.

3. Fungus Gnats

Fungus gnats are small insects that look like mosquitos and feed on fungi. They are also called dark-winged fungus gnats or mushroom flies and they have a special ability: they can glow in the dark during all the stages of their lives (except when they’re only an egg).

However, their light is the strongest when they are larvas. If you notice a lighting fungus gnat and you catch him by surprise, their luminous glow seems to suddenly turn off. That is because the insect tries to crawl into a crevice, masking its light.