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Species: orca. Though killer whales, also called orcas, are considered whales by most people, they are actually members of the Delphinidae (dolphin) family. Killer whales are excellent hunters that a wide range of prey, including fish, seals, and big whales such as blue whales.nteresting Facts: 1  Killer whales are social animals that live in stable family-related groups. 2  Killer whales display a high level of care for their offspring. 3  In addition to the mothers, various pod members (mainly adolescent females) perform most of the care for the calves.
Of the 78 species of whales, 11 species are baleen whales, which means that they eat by straining small organisms into their mouth. The rest of the species fall under the category of toothed whales. All whales live in a marine environment, or the sea, except for four species of river dolphins that thrive solely in fresh water. Whales all share a few common features, like blowholes. Blowholes are the nostrils of the whale and are positioned on top of the head.