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The narwhal’s tusk reveals its past living conditions – Science Daily

Every year, a new growth layer is added to the narwhal’s spiralled tusk. The individual layers act as an archive of data that reveals what and where the animal…

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Every year, a new growth layer is added to the narwhal’s spiralled tusk. The individual layers act as an archive of data that reveals what and where the animal has eaten, providing a glimpse of how the ice and environmental conditions have changed over its long life span (up to 50 years).Same as rings in a tree trunk, every year a new growth layer is added to the narwhal’s tusk, which grows longer and thicker throughout the animals life. Because the tusk is connected to the rest of body through…

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