agouty

 A rodent of the genus Dasyprocta, about the size of a rabbit, peculiar to South America and the West Indies. The most common species is the Dasyprocta agouti.  [1913 Webster]

 the color of the agouti{1}, a grayish-brown of grizzled texture; -- used especially to describe the color of the fur of a strain of mice. Also used attributively.  [PJC]