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).
from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/03/210311152749.htm
from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/03/210311152749.htm
The narwhal's tusk reveals its past living conditions
![The narwhal's tusk reveals its past living conditions]()
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March 12, 2021
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