it's not really a birth defect. in the womb every human fetus has gills... they are gone by the time we are born, however. but there are rare cases where you can see the remnants of gills on some humans necks. im not sure how common it is, but i take this is a reference to it.
it's not really a birth defect. in the womb every human fetus has gills... they are gone by the time we are born, however. but there are rare cases where you can see the remnants of gills on some humans necks. im not sure how common it is, but i take this is a reference to it.