Why Carefree Lady Fish Grow Larger Genitals

The history of Bahamas mosquitofish is written in their genitals. Though you’d have a hard time locating a female fish’s reproductive parts, they tell a story of predators, suitors, and finding a way to regain control.

Gambusia hubbsi arrived at Andros Island, in the Bahamas, about 15,000 years ago. The little fish live in vertical, water-filled caves called blue holes. Populations separated from each other by these caves are in the process of evolving into different species, pushed by th

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