An animal of the class Diplopoda, commonly known as a millipede, which has two pairs of legs per body segment.
From Greek diplo- (double) and pous (foot). The term literally means 'double foot' and refers to the distinctive anatomical feature that distinguishes millipedes from their centipede relatives.
Millipedes aren't actually trying to have a thousand legs—most have between 80 and 400 legs total—but the name comes from people overestimating! The 'diplo' part is perfectly accurate though: each segment truly has two pairs of legs, unlike centipedes which have one pair.
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