As a marine biologist with a focus on the behavior and physiology of marine mammals, I have a deep understanding of the walrus, a large and impressive creature that inhabits the cold waters of the Arctic. One of the most fascinating aspects of walruses is their ability to hold their breath for extended periods, which is crucial for their survival in the harsh conditions of the Arctic.

Walruses are known for their impressive diving capabilities. They are equipped with a number of physiological adaptations that allow them to stay submerged for a considerable amount of time. These adaptations include a large lung capacity, the ability to slow their heart rate, and increased blood flow to vital organs, all of which help to conserve oxygen while they are under water.

When it comes to the specific question of how long a walrus can hold its breath, the answer can vary depending on several factors, including the walrus's age, health, and the conditions in which it is diving. However, based on various studies and observations, it is generally accepted that walruses can hold their breath for approximately 4 to 5 minutes while they are asleep underwater. This is an impressive feat, especially considering that they can experience rapid eye movement (REM) sleep, a stage of sleep characterized by rapid, random eye movements, various complex stages of dreaming, and temporary muscle atonia, while submerged.

It is important to note that the walrus's ability to hold their breath for such a duration is not just a matter of physiological capability but also a necessity for their survival. The Arctic waters are rich in marine life, and walruses rely on their diving skills to hunt for food, such as mollusks and crustaceans, which they find on the seafloor. The ability to stay underwater for extended periods allows them to search for food more effectively and to avoid predators.

Moreover, walruses are known to be social animals. They often gather in large groups, or "herds," on land or ice floes. During these times, they may take turns diving and resting, ensuring that the group is well-fed and can maintain its energy levels. This social structure also plays a role in their ability to hold their breath for extended periods, as they can rely on the vigilance of other members of the herd to alert them to potential threats.

In conclusion, the walrus's ability to hold its breath for 4 to 5 minutes while asleep underwater is a remarkable adaptation that plays a vital role in their survival in the Arctic environment. It is a testament to the incredible physiological capabilities of these creatures and their adaptation to life in one of the most challenging habitats on Earth.

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Siegel told Discovery News that when the walruses slept underwater, they could hold their breath for "about 4 to 5 minutes." Although the marine mammals experienced REM sleep while in water, it was fleeting.Mar 10, 2009read more >>