The Family Caenolestidae is commonly known as the shrew opossums or rat opossums. Some other synonyms used for this family include shrew-mouse opossums, Inca rat opossums, Andean rat opossums, and Andean shrew-like opossums. These small marsupials are found in South America, mainly in the Andean region. They have a shrew-like appearance, with a pointed snout and small eyes. These opossums are mostly nocturnal and solitary, scavenging on insects, small animals, and fruits. They have prehensile tails and can climb trees. Despite their small size, they play an important role in their ecosystem, as they help to control insect populations and are prey for larger animals.