A family of small marine crustaceans related to copepods, found in ocean waters around the world.
From Greek 'eu' (well) + 'pteron' (wing/fin) + '-idae' (family suffix used in taxonomy), referring to the well-developed swimming appendages characteristic of this crustacean family.
These tiny creatures are so abundant in the ocean that they're a major part of the food web—trillions of them feed whales, fish, and seabirds, making them among the most important animals you've never heard of!
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