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9 of the world's largest animal swarms

krill, Euphausia Superba

Photo: Norkrill/Flickr

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Krill

Gatherings of krill are among the largest swarms of creatures on Earth. In fact, some of their swarms are so massive that scientists have taken to labeling them superswarms.

These diminutive crustaceans can be found in all the world's oceans, but their biggest superswarms are located in Antarctic seas, often stretching for tens of kilometers and measuring 30 meters deep.

Though individual krill are tiny, their superswarms are dense enough to be a principal food source for the world's largest animals: baleen whales.