The size of the narwhale male’s tusks decides the hierarchy between males. That is the conclusion of scientists, according to Sermitsiaq.
The tusk is used to tell the opponent that «I am bigger than you», says Zackary Graham of Arizona State University.
He is the main author of a recent study conducted in a collaboration between ASU, Greenland’s Institute of Nature and the Federal University of Sao Paolo in Brazil.
The study is based on data from 245 adult male narwhales from Greenland.