Orca Whales have 3 types of fins the Dorsal Fin and the Pectoral Fins. The Pectoral Fins and Dorsal Fin are to both stabalize and direct the animal. Their Skeletal Structure containing a scalpula, Humerus, Radius, Ulna, Carpus, Metacarpus, Phalanxes and the back limbs are absent of bones. The Pelvis Rudiments (Vestiges) remain to which the muscles that support and are connected to, the male reproductive apparatus. The Dorsal Fin and Fluke do not have a skeletal system but are made of dense interwoven fibres and cartilage. The Thermal Insulation of the Orca cools down its body very well due to subcutaneous fat. This takes place through fins with no fatty layer.The fins have numerous blood vessels in which they consequently purposeas heat exchangers. The Dorsal Fin of a Male Orca can grow up to 6 feet while the Dorsal Fin of a Female Orca can grow up to 4 feet. The Orca's head is conical with a distinctive round break and a white patch above and behind each eye. Orcas have very powerful muscles at the rear of their upper jaw to prevent the escape of large prey and a large throat so they can swallow food whole and so no need for chewing. The Orca's streamlined body saves energy and aids the food storage inside it. Orcas have a body that offers little resistance to water however their bodies differ between sexes. Male Orcas measure between 22 to 30 ft. (6.7-9m) and usually weigh between 8,000 and 12,00 lb. (3,628- 5,443 kg.). Female Orcas measure between 17 to 24 ft. (5.2-7.3 m) and usually weigh between 3,000 and 8,000 lb. (1,360- 3,628 kg). The fluke is a flattened pad of tough, dense fibrous connective tissue without bone. The arteries of the fluke are surrounded by veins which help to maintain astable body temperature. The dorsal Fin acts to stabalize the Orca and like the fluke the arteries inthe Dorsal Fin aresurrounded by veins to help keep a stable body temperature. The Orca's brain has the shape of a balloon and the brain has more helixes than any other mammal.