Narwhals aren't at the top of the food web. Which means they are the prey, to killerwhales. Now due to melting ice narwhals are bound to become endangered.
To keep safe narwhals used build safe zones, made out of ice. Now there is less sea ice allowing killerb whales to kill and eat them.
Narwhals depend on sea ice to hunt. Now because of melting sea ice it's effecting their hunting pattern.
Many narwhals have a traditional migration patteren. When sea ice melts it messes up their sense of navigation. Allowing them to get loseĀ