Least weasel – Mustela nivalis – Comadreja
The least weasel (Mustela nivalis), known as the “comadreja” in Spain, is the world’s smallest carnivore—measuring just 16–20 cm in length and weighing 25–45 g. These slender, nocturnal hunters sport seasonal coats—brown in summer, white in winter in colder regions—and feed on small rodents, insects, birds, and reptiles. In Spain, they thrive across diverse habitats, from Pyrenean woodlands to Andalusian fields. Females can produce multiple litters of 3–7 young per year, though wild weasels typically live only two to three years. Despite habitat loss and pesticide threats, conservation efforts help sustain their vital role as natural rodent controllers.