How a clitoris becomes a birth passage
In female spotted hyenas, the clitoris is enlarged into a long, erectile structure that resembles a penis. The resemblance is more than external: the urinary and reproductive tract runs through it, so the opening at its tip serves as the route for urine as well as mating and birth. Internally, the anatomy is still female; the structure is a clitoris, not a penis.
This arrangement develops before birth. Female hyenas are exposed to unusually high levels of androgen hormones during development, which help shape their distinctive external anatomy. The result is a body plan that makes the clitoris part of the route a cub must travel through during delivery.
The cost of a first delivery
That route is long and narrow, and it has not yet been stretched by a previous birth. A first-time mother may therefore face a particularly difficult delivery: the passage must expand as the cub moves through it, and the tissue can tear. A prolonged or obstructed birth can also leave a cub without enough oxygen. Some cubs die during this first journey.
Later births are generally less difficult because the passage has already been stretched, though delivery remains a demanding process. The anatomy makes a vivid point about evolution: a feature can be strikingly unusual without being a simple advantage or disadvantage. In this case, the structure is part of the hyena’s reproductive design, but it also imposes a real cost—especially on a mother’s first cub.
