Word: molliensia
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...Amazons. From the Scripps Institution of Oceanography at La Jolla, Calif., Dr. Carl Hubbs reported on a small fish called Molliensia formosa. It is a native of Mexico with an odd family tree...
...Hubbs collected his first "Mollies" in 1930, and was puzzled because he did not find a single male. He brought the females back to his aquarium in Michigan, watched them narrowly, discovered that they were Amazons.* Among the Molliensia formosa, there are no males at all. Their offspring (conceived internally) are all female. When Molly requires a male, she borrows him from a related species...