Most anatomy books wrongly state that the coccyx is normally fused in adults.
From the en.wikipedia.org
Sometimes during labour, the innominate bones, sacrum or coccyx rotate, flex, and extend.
From the telegraph.co.uk
Any kicks used in combat would have been thrown to the ankles, knees, groin and coccyx.
From the independent.co.uk
The human coccyx is normally composed of four rudimentary vertebrae fused into a single bone.
From the newscientist.com
Then he began to experience severe pain in his neck and coccyx.
From the express.co.uk
It was on my second attempt that I shattered my coccyx.
From the guardian.co.uk
It's not the most gnarly of attitudes but I have landed on my coccyx on an icy mountain and it hurt.
From the metro.co.uk
He underwent surgery to remove his coccyx bone and another bone from the site of his most severe pressure sore.
From the kentucky.com
Second, I can see the coccyx wiggling, yes.
From the guardian.co.uk
More examples
The end of the vertebral column in humans and tailless apes
Coccyx (genus) is a genus of moths belonging to the subfamily Olethreutinae of the family Tortricidae.
The final fused vertebrae at the base of the spine
A triangular shaped bone at the bottom of the spine. Also known as the tailbone.
The small tail-like bone at the bottom of the spine very near to the anus. The coccyx is made up of 3-5 rudimentary vertebrae. It is the lowest part of the spinal column.
Commonly called the tailbone, the coccyx is composed of four separate but fused vertebrae that make up the bottom of your spine.
Fused caudal or tail vertebrae. The coccyx is located below the sacrum.
Greek kokkyx = cuckoo, whose bill the coccyx resembles.
The "tail bone;" a group of four vertabrae that are fused together, located at the terminal end of the spine.