Then, after all, mermaids really existed! anyone would think. However, when mermaid mummies left behind in various parts of the world were examined using X-rays and other methods, it was discovered that all of them were imposters. Most of them were mummies made by combining a monkey and a large fish. In other words, mermaids are a human conception of a creature that does not actually exist. However, mermaids, whose body is half human and half fish, have been imagined by people in many countries around the world for a long time. The oldest mermaid doll in the world is believed to be nearly 2,700 years old. There are many other legends of these animals in China and Japan. Even though we live in different places and speak different languages, we humans think in the same way.