Mustela nivalis, commonly known as the least weasel or comadreja común in Spanish, is a small carnivorous mammal found in various regions, including the Comunidad Valenciana. It is the smallest member of the mustelid family, which also includes animals like otters and ferrets.

• Physical Characteristics: The least weasel has a slender, elongated body, short legs, and a relatively short tail. Its fur is typically brown on the back and white on the belly, with some seasonal variations that may include a completely white winter coat in colder regions.
• Habitat: This species is highly adaptable and can inhabit various environments such as forests, farmland, and grasslands. In the Comunidad Valenciana, they can often be found in areas with abundant cover and a good supply of prey.
• Diet: Mustela nivalis primarily feeds on small rodents such as mice and voles. It is an agile hunter, capable of pursuing its prey into burrows and tight spaces.
• Behavior: Least weasels are solitary animals, primarily nocturnal, though they may sometimes be active during the day. They are known for their curious and active nature, frequently exploring their environment.
• Reproduction: Breeding can occur throughout the year, with peak times varying based on local conditions. Females give birth to litters of multiple young after a gestation period of about five weeks.

In the Comunidad Valenciana, the comadreja común plays a vital role in the control of rodent populations and is an important part of the local ecosystem. Efforts to preserve its natural habitats contribute to maintaining the ecological balance in the region.