Beaver tails have a unique structure that allows them to perform various functions. The tail contains vertebrae, which are connected by flexible joints and supported by muscles. These vertebrae provide the tail with strength and flexibility. The muscles surrounding the vertebrae enable beavers to move their tails with great agility and power.
The tail bones are typically flat and rectangular, with a dense spongy structure that helps provide buoyancy and stability in water. The tail also contains blood vessels that regulate the beaver's body temperature, helping them maintain proper warmth while swimming or diving in cold water.