What kind of rat swims in water? - briefly
The semi‑aquatic rodent referred to as «water rat» (genus Nectomys) has webbed hind feet and a water‑repellent coat that allow effective swimming. It inhabits streams and rivers throughout South America.
What kind of rat swims in water? - in detail
The semi‑aquatic rodent known as the Australian water rat (Hydromys chrysogaster) exhibits the most pronounced swimming abilities among murine species. Its dense, water‑repellent fur, flattened tail, and partially webbed hind feet enable efficient propulsion and buoyancy. The species inhabits fast‑flowing streams and coastal lagoons, where it hunts fish, crustaceans, and amphibians. Sensory whiskers detect prey movements in turbid water, while powerful forelimb muscles generate rapid strokes.
The brown rat (Rattus norvegicus) also demonstrates strong swimming capacity. Muscular hind limbs and a long, laterally compressed tail provide thrust and steering. This species can traverse distances of up to 200 m in open water, a behavior observed when escaping predators or seeking food sources across flooded areas. Its lungs possess a high oxygen‑storage capacity, allowing prolonged submersion.
The black rat (Rattus rattus) shows moderate aquatic proficiency. Adaptations include a sleek body shape and a tail that functions as a rudder. Though less adept than its larger counterpart, it can cross small streams and survive brief immersion.
Key adaptations shared by these swimmers:
- Webbed or partially webbed hind feet for increased surface area.
- Tail morphology optimized for thrust and directional control.
- Fur treated with natural oils to reduce water absorption.
- Enhanced lung volume for extended underwater periods.
- Vibrissae tuned to detect hydrodynamic disturbances.
Ecological roles involve controlling aquatic invertebrate populations, dispersing seeds along water margins, and serving as prey for semi‑aquatic predators such as otters and birds of prey. Their presence indicates healthy riparian ecosystems and contributes to nutrient cycling within freshwater habitats.