Norse populations in Greenland vanished in the 15th century, and the reason has been a mystery for centuries. However, a recent study of medieval artifacts from across Europe suggests it may have been due to the over-hunting of walrus.
원문출처 : https://www.cnn.com/2020/01/07/world/vikings-walrus-trnd/index.html
원문출처 : https://www.cnn.com/2020/01/07/world/vikings-walrus-trnd/index.html