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The Arctic ground squirrel typically has a beige-tan pelage with a lightly-spotted backside. Similar to the related prairie dog, it has a shorter face than the typical arboreal squirrels–due to its lifestyle of burrowing–as well as smaller ears, with a dark tail and white markings around the eyes.
Hibernating Arctic ground squirrels may exhibit abdominal temperatures as low as −2.9 °C (26.8 °F), maintaining sub-zero abdominal temperatures for more than three weeks at a time, although the temperatures at the head and neck remain at 0 °C (32 °F) or above. [14]
Grey squirrels, or Eastern grey squirrels, primarily live in the Eastern half of the U.S. and southern Canada. There is also a healthy population in the U.K., where they were imported in the 19th ...
Urocitellus is a genus of ground squirrels.They were previously believed to belong to the much larger genus Spermophilus, but DNA sequencing of the cytochrome b gene showed that this group was paraphyletic to the prairie dogs and marmots, [2] [3] and could therefore no longer be retained as a single genus.
Thirteen-lined ground squirrels can survive in hibernation for over six months without food or water and special physiological adaptations allow them to do so. [6] They alternate between torpor bouts of 7 to 10 days when their body temperatures drops to 5-7°C, and interbout arousals of less than 24 hours with their body temperature back to 37 ...
The Columbian ground squirrel is one of the largest members of the genus, the largest being the Arctic ground squirrel. [2] They have a relatively sturdy, robust build. They measure 325–410 mm (12.8–16.1 in) in length overall, with a tail measuring 80–116 mm (3.1–4.6
The northern Idaho ground squirrel has an 8-month hibernation period from August to late April. Their diet consists of mostly forbs, grasses, shrubs, trees, rushes, and sedges. [4] The squirrel's active season is from April to July, and then the species spends the rest of the year hibernating. [12]
Aestivation (Latin: aestas (summer); also spelled estivation in American English) is a state of animal dormancy, similar to hibernation, although taking place in the summer rather than the winter. Aestivation is characterized by inactivity and a lowered metabolic rate, that is entered in response to high temperatures and arid conditions. [ 1 ]