Tiny jumping insects that live on animals and bite them to drink their blood.
From Old English 'fleah,' related to similar words in other Germanic languages. The word has remained basically unchanged for over 1,000 years, always referring to these parasitic pests.
Fleas are tiny superheroes of jumping—they can leap over 200 times their own body height, which is like a human jumping 400 feet in the air! This ability comes from special spring-like proteins in their legs.
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