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Humans and dolphins have even more in common than we might have thought, new research suggests. Biologists (các nhà sinh học) say they’ve found clear (rõ ràng) anatomical evidence (chứng cứ giải phẫu học) that female dolphins have a fully functional clitoris (âm vật) that helps them experience pleasure (cảm giác sung sướng) during sex—just as it does for humans. The findings may one day help scientists trace back the evolutionary origins (nguồn gốc tiến hóa) of the sexual organ and sex in general.

Lead author Patricia Brennan, an assistant professor of biological sciences at Mount Holyoke College in Massachusetts, and her team have been studying the evolution of genitals (cơ quan sinh dục ngoài) in all sorts of vertebrate (có xương sống) animals. More recently, they turned their attention to dolphins, the marine mammals known for their playful and eerily (kỳ lạ, kỳ quái) human-like nature at times (in ways good and bad).

“Dolphins have vaginal folds, and we were studying these folds to try to figure out their function and why they are so diverse across species,”

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