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It
takes the fruit fly Drosophila bifurca three weeks to make just
one sperm. The adult male is 3mm (0.1in) long and the sperm is a rather
disproportionate 58mm (2.3in). Drosophila melanogaster’s
sperm on the other hand is 1.9mm (0.07in) long, and this fruit fly can
begin copulating only a few hours after he tumbles out of his pupa.
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