Vestigial organs present in an adult individual are example of anatomical basis of evidences of evolution. Vestigial organs are non-functional organs in an organisms which are functional in related animals and were functional in the ancestors. There are 90 vestigial organs in the human body and mainly include coccyx, nictitating membrane, caecum, vermiform appendix, canines, wisdom tooth etc. Vestigial organs are also present in some other animals, eg, splint bones in horse, hind limbs and pelvic girdle in python, wings and feathers in flightless birds etc.