4100 x 4225 px | 34,7 x 35,8 cm | 13,7 x 14,1 inches | 300dpi
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The Mount Graham red squirrel Tamiasciurus hudsonicus grahamensis is one of 25 subspecies of red squirrels found thoughout North America The Mount Graham subspecies which is found only on the Pinaleno Graham Mountains of southeastern Arizona was thought to have been extinct in the 1950 s but small numbers of squirrels were rediscovered in the 1970 s The squirrel was added to the federal endangered species list in 1987 by the U S Fish and Wildlife Service when the estimated population in 1986 was fewer than 400 The Mount Graham subspecies has been isolated from other subspecies of red squirrels since the end of the Pleistocene glacial periods It is still rather unclear if the Mt Graham red squirrel is distinct or not from red squirrels elsewhere Studies on genetic data are in progress The Mt Graham red squirrel and the Pinale o Mountains have been the center of considerable controversy since the 1980 s due to the construction of The Mount Graham International Observatory on one of the highest peaks in the range
