Narwhal Tusk
  • Apr 6, 2021 8:00 pm
  • 17:21 mins

A tree’s rings show the history of that tree and what conditions were like for it from year to year. The same goes for the tusk of a narwhal. The unicorn-like horns on these whales are telling the story of climate change in the Arctic. Rune Dietz is a professor of marine mammal research at Aarhus University in Denmark.