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Fruit fly sperm is enormous - Popular Science

·Jun 22, 2026
Source: Popular Science
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Tails take up most of the real estate on a sperm cell.

They may have tiny bodies, but fruit flies produce giant sperm. Adult male Drosophila melanogaster fruit flies are about two millimeters long (roughly the size of a sesame seed) and their sperm can be just as long, with the sperm tails taking up most of that space.

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