Orcs are tall, muscular creatures, with adults standing around 8-9 feet on average. They have very pale, subdued skin tones of greys and greens, mostly hidden behind tufts of hair. Other distinguishing features are a snout-like nose, red eyes, and a pair of tusks. Most orcs are highly aggressive and emotional, but not malicious by nature. To put it simply, they are very in touch with how they feel and very honest about it. This leads many of them to act on impulse.
Orkin Swimming: Having evolved for this exact purpose, orcs are great swimmers, capable of swimming not only quickly, but for long periods of time. (Fitness)
Air conservation: Going with their natural talent for swimming, orcs are able to endure long periods of time without air. They also show immunity to the bends. (Resilience)
Cold Resistance: Orcs were born as a race in near arctic conditions, as such, they show greater resilience to low temperatures and cold weather that most creatures would. They also show immunity to the common cold. (Resilioence)