👉 Mergus is a term used in the context of the Roman and Greek mythology, specifically referring to a mythical creature or entity. It was often portrayed as a giant tortoise with a human body and wings, known for its ability to fly on a string passed through its body. The creature was believed to be able to cross rivers and mountains, but it did not have legs. Its name is said to have been derived from the Greek word "mērgus," which means "large"