Which snake is traditionally associated with the medical symbol called the Rod of Asclepius?

The Aesculapian snake is traditionally associated with the medical symbol called the Rod of Asclepius.

The Aesculapian snake, Zamenis longissimus, was linked with Asclepius, the ancient Greek god of medicine. In artistic and religious traditions, snakes were connected with renewal because they shed their skin. The Rod of Asclepius shows a single snake winding around a staff and remains a widely used symbol of medicine.

The Aesculapian snake is a nonvenomous colubrid found in parts of Europe and western Asia. It is a strong climber and can grow to roughly 2 metres. Its smooth appearance and calm nature have helped it remain a familiar cultural and zoological figure.

The Rod of Asclepius is often confused with the caduceus, which has two snakes and wings and was originally associated with Hermes. The two symbols have different histories.