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Which animal species is the most numerous on Earth?
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There would be 500 trillion in the Southern Ocean. The Antarctic krill is the most numerous animal species on Earth. This small crustacean lives in cold water and feeds on phytoplankton. Its biomass would represent the equivalent of the entire human population. Antarctic krill are the main food of whales, seals, and penguins. Photo credit: NOAA Photo Library
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