Common fat-tailed mouse opossum

{{Short description|Species of marsupial}}

{{Speciesbox

| name = Common fat-tailed mouse opossum{{MSW3 Didelphimorphia | id = 10400167 | page = 18}}

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=de la Sancha, N. |author2=Teta, P. |author3=Flores, D. |author4=Albanese, M.S. |date=2015 |title=Thylamys pusillus |volume=2015 |page=e.T201936A22172657 |doi=10.2305/IUCN.UK.2015-4.RLTS.T201936A22172657.en |access-date=12 November 2021}}

| genus = Thylamys

| species = pusillus

| authority = (Desmarest, 1804)

| synonyms =

| range_map = Common Fat-tailed Mouse Opossum area.png

| range_map_caption = Common fat-tailed mouse opossum range

}}

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. Its head-and-body length is about 75 to 120 (mean 94.3) mm, and its tail length is about 90 to 134 (mean 103.6) mm. Its dorsal fur is brownish gray, and its ventral fur is yellowish to white. 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.{{Cite book

| last = Eisenberg | first = John Frederick

|author2=Redford, Kent Hubbard

| title = Mammals of the Neotropics: The Central Neotropics: Ecuador, Peru, Bolivia, Brazil

| publisher = University of Chicago Press | date = 1999 | pages = 624

| url = https://books.google.com/books?id=p2MDAzCeQQoC

| isbn = 978-0-226-19542-1}} Its tail often lacks fat deposits, but does not always.{{Cite book

| last = Gardner | first = Alfred L.

| title = Mammals of South America: Marsupials, xenarthrans, shrews, and bats

| publisher = University of Chicago Press | date = 2008 | pages = 669

| url = https://books.google.com/books?id=dbU3d7EUCm8C

| isbn = 978-0-226-28240-4}}