In marine mammals’ battle of the sexes, vaginal folds can make the difference

Patricia Brennan has made a splash with her studies of genitalia and fit

harbor porpoise

FERTILE FOLDS In harbor porpoises (one shown), females have vaginal folds (3-D endocast shown below) that may help them exert control over fertilization.

Solvin Zankl/Alamy Stock Photo

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