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According to National Geographic, orcas are considered the largest species of the dolphin family. They weigh up to 6 tons (5,443 kilograms) and grow to 23 to 32 feet (7 to 9.7 meters). That is almost as long as a school bus. The largest orca ever recorded was 32 feet (9.8 m) long, according to Sea World.
Size. Orcas are known for their long dorsal fin (the fin on the animal's back) and black-and-white coloring. Just behind the dorsal fin is a patch of gray called a saddle â because it looks like a riding saddle. An orca's body is cylindrical and tapers at both ends to form an aerodynamic shape.iller whales are the most widely distributed mammals, other than humans, according to Sea World. They live in the oceans and seas surrounding most coastal countries. They adapt very well to any climate. For example, they can live in the warm waters near the equator or the icy waters of the North and South Pole regions.