The dolphin's skeleton is exquisitely tailored to its life in the water. The ribs of dolphins are not strongly attached to the spine or to the breastbone.
It has three main parts, head, trunk and tail, … The bones are lighter than the bones of land mammals. The bones are lighter than the bones of land mammals. The skeleton still retains vestiges of a terrestrial life, like a pair of floating bones under the backbone that should have been a pelvis. The pelvis (plural pelves or pelvises) is either the lower part of the trunk of the human body between the abdomen and the thighs (sometimes also called pelvic region of the trunk) or the skeleton embedded in it (sometimes also called bony pelvis, or pelvic skeleton)..
The pectoral fins, which have the same general skeletal elements as the human arm, are flattened out and used for steering. The hind limbs have all but disappeared from the dolphin skeleton structure, however there are still traces of the pelvic girdle, and in some cases, the femur is buried deep inside the abdominal blubber and muscle.
The dorsal fin and the tail flukes, which are composed of only tough fibrous connective tissue (no bone), are used … Short bone of the pectoral fin between the humerus and the carpus. The dolphin's skeleton is exquisitely tailored to its life in the water. The pectoral fins, which have the same general skeletal elements as the human arm, are flattened out and used for steering.
The spine is flexible to allow for up and down movement. In October 2006, an unusual bottlenose dolphin was captured in Japan; it had small fins on each side of its genital slit, which scientists believe to be an unusually pronounced development of … These are connected to powerful muscles that help dolphins swim so gracefully and quickly. From the pelvic bone to the end of the dolphin is a set of tail bones. The modern dolphin skeleton has two small, rod-shaped pelvic bones thought to be vestigial hind limbs. Cetaceans (whales and dolphins) offer a unique opportunity to test this hypothesis: since evolving from land-dwelling ancestors, they lost external hind limbs and evolved a highly reduced pelvis which seems to serve no other function except to anchor muscles that maneuver the penis.
These "floating ribs" are often joined, enabling the rib cage to collapse under the pressure of a deep dive … On the other hand, the body of the dolphins is fusiform and hydrodynamic, perfectly adapted to life in the water. You can visit www.blue-world.org/en/education/play-and-learn/skeleton and build your own dolphin skeleton. The spine is flexible to allow for up and down movement.