Hold Your Breath
Belugas are great divers: they can reach depths of 800 meters and hold their breath for up to 25 minutes.
Belugas don’t often do deep dives while in the Churchill River, especially since it is relatively shallow. However, the ability to hold their breath for so long could help them avoid one of their predators, the polar bear. If they see a big white bear coming, they can just dive under water for a while and head elsewhere. This skill should prove very useful near Churchill where polar bears have recently been spotted along the coast!