Endemic to a very specific fragment of pine-oak forest in the mountains of north-western Mexico, this ground squirrel has a distribution so restricted that its entire global range could probably be walked on foot in a few days. Closely related to the Golden-mantled Ground Squirrel of North America, it shares its striking dark eye mask and the habit of laying down fat reserves before passing the coldest months in partial torpor. The species is one of many examples of high-mountain endemic fauna created by the geographical isolation of the various ranges that make up the Sierra Madre Occidental, each supporting its own set of exclusive species.
Small- to medium-sized ground squirrel with reddish-brown fur, a striking dark mask around the eyes and a golden stripe on the head and shoulders, and a moderately bushy tail of medium length. It is distinguished from other ground squirrels in the region by this very marked eye mask, a trait shared with its much more widespread relative in western North America.
Small track, the hind 3-4 cm, with 5 toes on the hind foot and 4 on the fore foot, similar to those of other ground squirrels in the region. Small, elongated droppings 0.8-1.2 cm long, left scattered near the entrance to the burrow. It digs burrows with a main entrance 6-8 cm in diameter, often located at the base of a trunk or rock, with mounds of excavated soil visible at the opening.
Montane pine-oak forest, generally between 2000 and 3000 m altitude. Endemic to a very small area of the Sierra Madre Occidental in north-western Mexico, with no natural presence outside these mountains.
Herbivorous and granivorous, feeding on seeds, nuts, herbs and fungi, laying down body fat reserves before the winter period of reduced activity.
Diurnal and terrestrial, with a small home range around its burrow system. It reduces its activity during the coldest months of the year in partial torpor, a behaviour shared with other cold-climate mountain squirrels.
Its extremely small distribution, restricted to a specific fragment of the Sierra Madre Occidental, makes it inherently vulnerable to any alteration of its pine-oak forest habitat, although no severe recent population declines have been documented within its known range.
Loss and degradation of montane pine-oak forest through logging and land-use changes, along with the extremely restricted geographical range of the species itself, which leaves it vulnerable to any adverse local event.
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