Meet the Desman: More Than Just a Rodent Lookalike
At first glance, the Russian Desman (Desmana moschata) might easily be mistaken for a water-loving rodent. However, this curious creature is actually a specialized, semi-aquatic relative of the humble garden mole. Measuring between 18 to 22 cm in body length with a tail of matching length, and weighing up to 500 grams, the desman is uniquely adapted to a life split between the water and underground burrows.
Velvety Armor: The Unique Fur of the Desman
One of the most remarkable physiological features of the desman is its thick, velvety, and exceptionally durable fur. Unlike many other mammals, desman hairs actually widen toward the tip and narrow toward the root. This specialized structure traps a layer of air, keeping the animal dry and insulated while swimming. Historically, this pelt was so strong and water-resistant that it was heavily targeted for the production of luxury fur coats and hats.
Aquatic Lifestyle and Burrowing Habits
Desmans lead a strictly semi-aquatic lifestyle. For the majority of the year, they reside in intricate burrows dug into riverbanks. Uniquely, the sole entrance to each burrow is located entirely underwater, providing the desman with a secure hideout safe from many terrestrial predators.
A High-Octane Metabolism: The Desman Diet
Due to their active lifestyle in cold water, desmans require a staggering amount of nourishment. An adult desman can consume an amount of food equal to its entire body weight in just a single 24-hour period! During the warmer summer months, their diet consists primarily of benthic fauna, including caddisfly larvae, leeches, gastropods, and various aquatic invertebrates. When winter arrives and the water freezes over, their diet adapts to include plant matter and small fish.