According to National Geographic, a leopard seal can hold its breath for up to 10 minutes. This is due to an adaptation that allows the seal to store an extremely large amount of oxygen within the blood and muscles, about three times as much as humans based on weight.
The leopard seal is a predatory mammal that approaches nearly 12 feet in length and can weigh up to 840 pounds. It is the only type of seal that preys on warm-blooded animals, including other seals. The leopard seal lives in Antarctic and sub-Antarctic waters. Blubber allows the leopard seal to endure frigid temperatures.