Scientists say they have the first recorded video evidence of narwhals using tusks not only to strike and manipulate fish ...

The whales, which have distinctively long tusks, were filmed in the Arctic chasing a fish in what seemed like a “cat-and-mouse” game, surprising scientists.

"Narwhals are highly sensitive and vulnerable to the effects of climate change because of the very close association of their lives with sea ice for food, navigation and refuge," Moscrop said.