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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.
Facts About Orcas. Orcas are the most widely distributed of all whales and dolphins, found in every ocean. But though the species is widespread, orca populations are actually very localized. The orca communities that live in the Pacific Northwest stay in that area, and those in the Antarctic stay south of the Equator.acts About Orcas. Orcas are the most widely distributed of all whales and dolphins, found in every ocean. But though the species is widespread, orca populations are actually very localized. The orca communities that live in the Pacific Northwest stay in that area, and those in the Antarctic stay south of the Equator.