This video says about itself:
Weird Ocean Predators Feed On Plankton – Blue Planet – BBC Earth
5 February 2017
In the height of the day, Petrels perform a weird and wonderful dance on the sea surface to feed on yellow-fin tuna eggs and other tiny plankton. Once the sun has set, bizarre glowing jellyfish spring from the ocean depths to feed on the tiny life that floats on the waves.
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