Transcription: Whales are the largest animals on Earth, reaching lengths of up to 100 feet. Like all mammals, whales have lungs and must come to the surface to breathe. However, some can dive for up to two hours. Whales are grouped into two major categories, the baleen whales, which do not have teeth and live off plankton, and the toothed whales, which feed primarily on fish and squid. Most of the large whales, such as humpbacks, blues, and grays, are baleen whales. Toothed whales include the members of the dolphin family, such as this killer whale.
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