A tiny jumping insect with no wings that lives on the skin of animals like dogs and cats and drinks their blood.
From Old English 'fleah,' related to Old German 'flöh.' The word has remained nearly unchanged for over a thousand years, suggesting fleas have been a constant pest throughout human history.
A flea can jump 200 times its own body length—if a human could jump that proportionally, you could leap over a 40-story building!
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