average: (in science) A term for the arithmetic mean, which is the sum of a group of numbers that is then divided by the size of the group.
behavior: The way something, often a person or other organism, acts towards others, or conducts itself.
brain waves: Electrical signals produced through the coordinated activity of billions of nerve cells in the brain of an animal. When charted, the signal typically looks wavy or spiky.
dolphins: A highly intelligent group of marine mammals that belong to the toothed-whale family. Members of this group include orcas (killer whales), pilot whales and bottlenose dolphins.
killer whale: A dolphin species (Orcinus orca) whose name means whale killer. These animals belong to the order of marine mammals known as Cetacea (or cetaceans).
literally: An adjective indicating that the phrase it modifies is precisely true. For instance, to say: “It’s so cold that I’m literally dying,” means that this person actually expects to soon be dead, the result of getting too cold.
marine mammal: Any of many types of mammals that spend most of its life in the ocean environment. These include whales and dolphins, walruses and sea lions, seals and sea otters, manatees and dugongs — even polar bears.
molt: (v.) To cast or shed skin, exoskeleton or feathers, which will be replaced with new. (n.) The act of molting, or the thing that is dropped during molting.
Pacific: The largest of the world’s five oceans. It separates Asia and Australia to the west from North and South America to the east.
predator: (adjective: predatory) A creature that preys on other animals for most or all of its food.
REM sleep: A period of sleep that takes its name for the rapid eye movement , or REM, that occurs. People dream during REM sleep, but their bodies can’t move. In non-REM sleep, breathing and brain activity slow, but people can still move about.
sea: An ocean (or region that is part of an ocean). Unlike lakes and streams, seawater — or ocean water — is…
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