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Cetacea Whales Cetacea Dolphins Cetacea Porpoises Mysticeti Baleen Whales Odontoceti Toothed Whale Carnivora Placental Mammals Ursidae Bears Mustelidae Weasels Pinnipedia Seals in general Otaridae Eared seals (sea lions and sea otters) Phocidae Earless seal Odobenidae Walrus Sirenia Manatee Myoglobin A red protein that caries and stores oxygen in muscle cells. Bradycardia An abnormally slow heart reaction. Rete mirable A complex of arteries and veins lying very close to each other, found in some vertebrates. Apneustic breathing An abnormal pattern of breathing characterized by deep, gasping inhilation with a pause at full inhilation followed by a brief, insufficient release. Spermaceti Organ Highly prized for it's oil. Melon A mass of waxy material in the head of dolphins and other toothed whales, thought to focus acoustic signals. Lower Mandible Where an animal receives echolocation signals.