flat-skulled marsupial mouse

…the flat-skulled marsupial mice, or planigales (Planigale), are similar to the true shrews (Sorex). The Red Data Book lists the eastern jerboa marsupial, or kultarr (Antechinomys laniger), of Australia as endangered; several other marsupial mice are considered rare.

…especially the long-tailed planigale (Planigale ingrami), measuring barely 12 cm (4.7 inches) in total length. Most marsupials range from the size of a squirrel to that of a medium-size dog.