In Happy Feet, two orcas help Lovelace escape the plastic rings around his neck, which have been choking him. Killer whales have never been extensively hunted by humans, but killer whales have been known to attack humans, both in the wild and in captivity, and very few killer whales have killed humans. Orcas are immediately recognizable by their distinctive black-and-white coloring and are the intelligent, trainable stars of many aquarium shows. Mothers give birth every three to ten years, after a 17-month pregnancy. Killer whales are protective of their young, and other adolescent females often assist the mother in caring for them. They use echolocation to communicate and hunt, making sounds that travel underwater until they encounter objects, then bounce back, revealing their location, size, and shape. Whales make a wide variety of communicative sounds, and each pod has distinctive noises that its members will recognize even at a distance. All pods use effective, cooperative hunting techniques that some liken to the behavior of wolf packs. Resident pods tend to prefer fish, while transient pods target marine mammals. These different groups may prey on different animals and use different techniques to catch them. There appear to be both resident and transient pod populations of killer whales. Killer whales hunt in deadly pods, family groups of up to 40 individuals. Though they often frequent cold, coastal waters, orcas can be found from the polar regions to the Equator. They are known to grab seals right off the ice. They feast on marine mammals such as seals, sea lions, dolphins and even other whales, employing teeth that can be four inches (ten centimeters) long. Orcas, or killer whales, are the largest of the dolphins and one of the world's most powerful predators.
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