1. During the course of evolution some organs remain in organisms, even though they don’t have any work to do.
2. For example appendix in the digestive system of human beings has no role to play in the process of digestion.
3. But in herbivores like rabbit appendix plays important role.
4. Such type of organs which are not useful in animal are called “vestigial organs”.
5. There are nearly 180 vestigial organs in human beings such as pinna, hair on skin, mammary glands in human, etc.
6. That’s why human being is said to be a moving museum of vestigial organs.
