Why do human beings still have remains of tails in our skeletal system?
Why do human beings still have remains of tails in our skeletal system?
user
This is an excellent question!  You’re right, the tail bones are referred to as “coccyx” (pronounced “kok-sis”) and are located at the bottom of the spine, near the end.  These are called coccyx because they look a little like a cuckoo bird.
assistant
What is our earliest ancestors who had functioning tails? Do we know what the species is?
user