An embryo of Cape housesnake (Boaedon capensis), showing right-handed coiling. An embryo of Cape housesnake (Boaedon capensis), showing right-handed coiling. An embryo of Cape housesnake (Boaedon capensis), showing right-handed coiling.

Source: https://news.ubc.ca/2026/08/scientists-learn-why-snakes-in-an-egg-all-coil-in-the-same-direction