Common fat-tailed mouse opossum
The common fat-tailed mouse opossum (Thylamys pusillus) is a species of opossum in the family Didelphidae.It occurs in Argentina, Bolivia, and Paraguay in chaco and Andean foothill habitats.The legs and cheeks are the same color as the ventral surface.Its tail is sharply bicolored (divided into two colors).A ring of faintly darker fur surrounds each eye.