Toros look like large rats with soft fur on the body and long guard hairs on the scaly tail.Emmons, L.H. 2005. A Revision of the Genera of Arboreal Echimyidae (Rodentia: Echimyidae, Echimyinae), With Descriptions of Two New Genera. pp. 247–310 in Lacey, E.A. & Myers, P. 2005. Mammalian Diversification: From Chromosomes to Phylogeography (A Celebration of the Career of James L. Patton). University of California Publications in Zoology. Head and body is 18-27.5 cm and tail is 17–30 cm. Weight is 320-570 grams.
