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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.
Orcas are highly intelligent, socially organized marine mammals in the order Cetacea, a group that includes both dolphins and whales. Although known as killer whales, orcas are actually the largest species of dolphin.