Scientists say they have the first recorded video evidence of narwhals using tusks not only to strike and manipulate fish during feeding but also engage in what appears to be playful behavior, ...

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.

One video revealed evidence of the marine mammals employing their tusks — which can measure nearly nine feet long — to hunt fish. In the video, several narwhals can be seen speeding toward ...