Hudson's oldfield mouse
Encyclopedia
Hudson's oldfield mouse (Thomasomys hudsoni) is a species of rodent
Rodent
Rodentia is an order of mammals also known as rodents, characterised by two continuously growing incisors in the upper and lower jaws which must be kept short by gnawing....

 in the family Cricetidae
Cricetidae
The Cricetidae are a family of rodents in the large and complex superfamily Muroidea. It includes true hamsters, voles, lemmings, and New World rats and mice...

. It is known only from the Andes
Andes
The Andes is the world's longest continental mountain range. It is a continual range of highlands along the western coast of South America. This range is about long, about to wide , and of an average height of about .Along its length, the Andes is split into several ranges, which are separated...

 in southern Ecuador
Ecuador
Ecuador , officially the Republic of Ecuador is a representative democratic republic in South America, bordered by Colombia on the north, Peru on the east and south, and by the Pacific Ocean to the west. It is one of only two countries in South America, along with Chile, that do not have a border...

, where is has been found at an elevation of 3100 m. It was formerly considered a subspecies of T. gracilis. It is named after American zoologist Wilfred Hudson Osgood
Wilfred Hudson Osgood
Wilfred Hudson Osgood was an American zoologist.Osgood was working as a biologist in the United States Department of Agriculture from 1897 to 1909. Then he moved to the Field Museum of Natural History in Chicago, where he was assistant curator of mammalogy and ornithology from 1909 to 1921, and...

.
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