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The prize for the world's longest sperm cells goes to drosophila bifurca, a species of fruit fly. Males of this species are known to have the longest sperm cells of any organism on Earth, an astonishing 5.8 cm long when uncoiled - or more than 1,000 times longer than a human's sperm cell. Actually, the testicles make up 11% of the body mass of a fruit fly. The females have just as long reproductive intestines - formed like an obstacle course with strong chemicals, designed to de-select the weak sperm cells.
Answer time 0s (0s). 20% have previously answered correct on this question. The question was created 2011-11-05.
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