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Water flea

Water flea, any of a group of small animals belonging to the class Branchiopoda. Most species live in fresh water and are anywhere from 1/125–3/4 in (0.2–18 mm) long. Their bodies are covered by a transparent shell, exposing their organs for easy viewing. Water fleas move through water by jumping in jerky motions resembling those of fleas—hence their name.

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