Mammals of the Southwest Mountains and MesasOlin, George
Science
Mammals of the Southwest Mountains and Mesas
Olin, George
Mammals -- Southwest, New
Range: Western United States and Canada. In the area covered by this
book to be found in western Colorado, from northeastern Utah south
through central Utah to central Arizona thence east into western New
Mexico.
[Illustration: Habitat map]
Habitat: Higher mountains of this area. Usually found in evergreen
forests of the Transition, Hudsonian, and Canadian Life Zones. It
sometimes occurs near the upper limits of the Upper Sonoran Zone.
Description: A chipmunk-like ground squirrel lacking the stripes along
the sides of the face characteristic of the chipmunks. Total length 8½
to 12½ inches. Tail 2½ to 4½ inches. There is much color variation in
this species. Head coppery to chestnut, upper surfaces of body brownish
gray to buffy. A light to white stripe bordered with black is present on
each side of the back. Under surface of tail gray to yellow. Tail short
but fully haired. Under surfaces of body lighter, gray to buffy gray.
Legs short, body chunky in comparison with chipmunks. Young, four to
eight, with but one litter each year.
The golden-mantled ground squirrel has been chosen from the rather large
group of southwestern ground squirrels because it is most typically a
mountain dwelling species. As such it does not have the advantages of a
long summer season like its lowland relatives. This results in two
definite periods each year. One is feverish activity during summer, a
time of breeding, rearing the young, storing food, and laying on fat for
the cold months ahead. The other in winter is the exact opposite—a long
interval of hibernation when, buried deep under the snow in a snug
burrow, the squirrels sleep away the winter.
Though hampered by the short summers of higher elevations, the
golden-mantled ground squirrels manage to lengthen the season slightly
by a very simple expedient. Instinct prompts them to dig their burrows
on a southern exposure, often under the base of a log or in a rock
slide. Here the snow melts away first and they often have a bare spot of
ground in front of the burrow several weeks in advance of the season.
The squirrels emerge from their long sleep weak and emaciated, and their
first days above ground are spent soaking up the warm sunshine and
waking up, so to speak. During this period they live on stores laid away
the previous summer, and by the time the snow has melted they are fully
active and ready for mating.
[Illustration: golden-mantled ground squirrel]
Public-domain text, read in full here on John Shaqi.
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