Primates

The coccyxx is the anatomical term for the remnant of a tail in humas. Two of the characteristics that all primates share are that they have nails at the end of their fingers instead of claws they also all have long fingers. These hands make it possible for the primates to do a lot of things that most mammals are unable to do. The thumb they have allows them to grasp onto things, an important ability if living on branches and using hands to navigate throughout the branches.  Opposable thumbs can me moved around to touch other fingers on a hand this allows for the ability to grasp things. Not all primates have the opposable thumb.