Thenutria (Myocastor coypus) belongs to theclass of Mammals, Rodents order, family Myocastoridae. It leads a semiaquatic lifestyle and can be seen aroundrivers, lakes and marshes. Nutria is the biggest rodent in Bulgaria.Itlives mainly along the rivers of southeastern Bulgaria. The animal’s body iscylindrical in shape, with relatively large head and short ears. The peak ofthe face is blunted with clearly visible teeth, colored in bright orange.Nutrias are mostly herbivores. Their role is to spread diseases such as equineencephalomyelitis, leptospirosis, hemorrhagic septicemia (Pasteurellosis), paratyphoid and salmonellosis. The aim of thestudy is to examine the impact of nutria on the environment on the territory ofStara Zagora region, and some of its biological and anatomical features. Insome territories of Stara Zagora were found traces of life activity of nutria,as entrances of shelters, footprints of thoracic and pelvic limbs, and feces. Nutriashave not permanent habitats. In the study we found no evidence of damage on theenvironment. The study showed that the result of the vital activity of nutriasis rather positive, concerning the cleaning of the water areas of vegetation. Wefound that the thoracic and pelvic limbs have five fingers. The difference between the volume of the nutria braincavity and these of the jackal and fox is provoked by the differences in thetype of their food and lifestyle.Thenutria (Myocastor coypus) belongs to theclass of Mammals, Rodents order, family Myocastoridae. It leads a semiaquatic lifestyle and can be seen aroundrivers, lakes and marshes. Nutria is the biggest rodent in Bulgaria.Itlives mainly along the rivers of southeastern Bulgaria. The animal’s body iscylindrical in shape, with relatively large head and short ears. The peak ofthe face is blunted with clearly visible teeth, colored in bright orange.Nutrias are mostly herbivores. Their role is to spread diseases such as equineencephalomyelitis, leptospirosis, hemorrhagic septicemia (Pasteurellosis), paratyphoid and salmonellosis. The aim of thestudy is to examine the impact of nutria on the environment on the territory ofStara Zagora region, and some of its biological and anatomical features. Insome territories of Stara Zagora were found traces of life activity of nutria,as entrances of shelters, footprints of thoracic and pelvic limbs, and feces. Nutriashave not permanent habitats. In the study we found no evidence of damage on theenvironment. The study showed that the result of the vital activity of nutriasis rather positive, concerning the cleaning of the water areas of vegetation. Wefound that the thoracic and pelvic limbs have five fingers. The difference between the volume of the nutria braincavity and these of the jackal and fox is provoked by the differences in thetype of their food and lifestyle.