
Lundomys molitor is a medium-sized rodent with a robust body, well-adapted to its forested environment. Its dense, coarse fur ranges from muted brown to soft grey, blending seamlessly with the woodland floor. The creature sports large, expressive eyes and long, sensitive whiskers that accentuate its alert nature. Its slightly elongated snout and sturdy limbs are perfect for both climbing and digging, while its moderately bushy tail aids in balance and communication, giving it a distinctive and appealing look within its natural habitat.

| Population: | Not currently threatened; exact numbers unknown |
| Generation Length: | 1-2 years |
| Average Weight: | 25-50 grams |
| Average Length: | Head and body length averaging 193 mm; tail length averaging 235 mm |
| Lifespan: | 3-4 years |
| Diet: | Herbivorous |
| Conservation Status: | Least Concern (LC) |
Lundomys molitor is primarily nocturnal, exhibiting heightened activity during twilight hours. It adeptly navigates dense undergrowth and makes use of both arboreal pathways and terrestrial trails to forage and find shelter. Typically solitary, this rodent constructs intricate burrows or utilizes natural crevices in fallen logs as daytime refuges. During periods of increased social interaction, especially in the breeding season, individuals cautiously come together. Its acute senses of hearing and smell help it evade predators and explore a variety of microhabitats, ensuring survival in a competitive environment while maintaining a balanced lifestyle of foraging and resting.
Lundomys molitor maintains a varied diet that reflects its adaptive nature in diverse environments. It feeds on a range of fruits, seeds, and leafy vegetation, which supply essential vitamins and minerals. This rodent also supplements its diet with small insects, worms, and other invertebrates, ensuring an ample intake of proteins and fats. Its digestive system is efficiently designed to process fibrous plant material and nutrient-rich animal prey alike. This flexible nutritional strategy not only supports its energetic lifestyle but also contributes to seed dispersal and the overall ecological health of its forest ecosystem.
During the mating season, Lundomys molitor engages in subtle yet complex courtship rituals. Males initiate encounters by scent-marking their territories and cautiously approaching potential mates. Gentle nuzzling and soft vocalizations facilitate communication between sexes, allowing them to assess compatibility. These brief but intense interactions ensure successful mating while minimizing energy expenditure and reducing the risk of predation.
The population of Lundomys molitor remains stable but localized, predominantly in well-preserved forest habitats. Although not currently endangered, its numbers are vulnerable to habitat fragmentation and deforestation. Conservation initiatives focus on protecting natural environments and mitigating human-induced disturbances, ensuring that this unique species continues to fulfill its ecological role and thrive in its natural setting.
Semiaquatic; excellent swimmer
Not specified
Not specified
Herbivore
Swamps or near streams
Non-migratory
Uruguay and nearby Rio Grande do Sul, Brazil
Areas with mean winter temperatures over 12°C, mean annual temperatures over 18°C, annual rainfall over 1,100 mm, and a long rainy season averaging over 200 days
Not specified
Not applicable
Herbivorous; diet includes green plant material
Herbivorous
Not specified
A female caught in April was pregnant with three embryos
Not specified
Lundomys molitor constructs intricate spherical nests above water using surrounding reeds.
These nests, positioned about 20 centimeters above the water, feature a central chamber connected to the water by a reed ramp, showcasing the species' remarkable adaptation to its semiaquatic lifestyle.



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