The term "caudal vertebrae" refers to the bones that make up the tail of a vertebrate animal. Synonyms for "caudal vertebrae" include "tail vertebrae," "coccygeal vertebrae," and "tailbone." The number of caudal vertebrae can vary greatly between species, with some having only a few while others have dozens. In humans, the caudal vertebrae are fused together to form the coccyx, which serves as an attachment site for various muscles and tendons. These bones play an important role in balance, movement, and stability in animals and are a crucial part of the musculoskeletal system.