Human Body

There are over 2,380 flea species worldwide. The oldest fossil flea ever found is about 200 million years old and doesn't appear to differ from modern fleas. A human-body flea can jump 13 inches, or over 104 times its own body length. In human terms, that would mean a 4-foot-tall child could jump 416 feet, more than the length of a football field.

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