Orcas have long, rounded bodies with large dorsal fins at the middle of their backs.
Their black bodies are marked with white patches on the underside and near the eyes. The average male orca grows to 23 feet long and weighs 7 to 10 tons. Females average 21 feet long and weigh 4 to 6 tons. The worldwide population of orcas is unknown. Orcas live 30 to 50 years in the wild.