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Photo Gallery: Whales
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Photo: Sunlight reflected through water ripples illuminates a sperm whale
Photo: Humpback whale breachingPhoto: A northern right whale breachingPhoto: Sunlight reflected through water ripples illuminates a sperm whalePhoto: Killer whale breachingPhoto: A gray whale cruises the glassy waters of Grice BayPhoto: Humpback whales in the singing positionPhoto: A northern right whale near the water's surfacePhoto: Beluga whale swimmingPhoto: Gray whale pokes its head above waterPhoto: A young blue whale
ENLARGEWALLPAPER
Sperm whales' heads are filled with a mysterious substance called spermaceti. Scientists have yet to understand its function, but believe it may help the animal regulate its buoyancy.
Photograph by Brian J. Skerry

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