During the course of evolution some organs remain in the organisms.We have already know about the appendix in the digestive system.In human beings it has no role to play in the process of digestion.
But in Herbivores like rabbit appendix plays an important role
Such type of organs which are not useful in animal are called vestigial organs.
There are nearly 180 vestigial organs in Human beings.
For Example Pinna,Hair on skin,mammary glands in human etc...
That's why Human being is said to be a moving museum of vestigial organs
1 5 1
In the process of evolution some organs are inherited . In these some organs are not use full to the organism but still they are inherited. These organs which are not use full to the organisms are called "Vestigial Organs".
In humans the best examples are "appendix, hair on skin etc". The Humans contain nearly 180 vestigial organs. That's why Human  Being said to be a "moving museum of vestigial organs".