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 and is reproduced here as part of the Climate Desk collaboration.  Researchers have long debated what the 10-foot-long tooth that erupts from a narwhal’s head is actually  for. Perhaps it has something to do with sexual selection, and males with longer horns attract more females. Or maybe the things sense salinity. Or perhaps a narwhal uses its tusk to flush out prey on the ocean bottom. Whatever the purpose, scientists know this for certain: The Arctic region, which the narwhals call home, is warming twice as fast as the rest of the planet, and by analyzing these tusks, researchers can glean surprisingly detailed insights into how the animals are dealing with catastrophic change. It’s not looking good.

Moe flanneryJean pierre desforgesCalifornia academy of sciencesMcgill universityCurrent biologyCalifornia academyஜீன் பியர் சேபோர்ஜ்ஸ்கலிஃபோர்னியா கலைக்கழகம் ஆஃப் அறிவியல்மகில் பல்கலைக்கழகம்தற்போதைய உயிரியல்கலிஃபோர்னியா கலைக்கழகம்