Multiple behaviors were observed that indicate narwhal tusks — like Swiss Army knives — serve as multi-purpose tools. While they likely evolved for sexual selection (males use their tusks to compete ...

In response to these challenges, narwhals may dive deeper into the ocean to hunt for larger or denser schools of fish, making the trade-off for easier catches more worthwhile, O’Corry-Crowe said.

Narwhals, which are related to beluga whales, are found here and throughout other parts of Canada, Greenland ... measure nearly nine feet long — to hunt fish. In the video, several narwhals ...