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Increased pollution of the seas. Hunting. Insufficient supply of food. Disease.
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Breeding habits of whales. Differences between whales. Efforts to preserve whales. The intelligence of whales.
The blue whale is larger than the sperm whale. The beluga is larger than the blue whale. The killer whale is larger than the sperm whale. The porpoise is larger than the killer whale.
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a bird a giant an elephant a submarine
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narwhals dolphins blue whales pilot whales
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