On Eli Malik island in the South Pacific nation of Palau lies Jellyfish Lake, home to a unique species of harmless jellyfish. Adventure photographer Sarosh Jacob dove into the lake armed with a Canon 5D Mark II and fisheye lens with underwater housing, and cobbled together this gem from the footage. From his description:
These fascinating creatures survive by sharing a symbiotic relationship with algae that live inside of them. At night, the jellyfish go down to the depths of the lake where the algae feed on nutrients. During the day, the jellyfish come back to the surface and follow the sun across the lake in a massive migration. The algae convert the energy of the sun via photosynthesis into a sugar that feeds the jellyfish.
Wowee! Nature. Is. Amazing.