ground squirrel
dr. dolittle | January 22, 2016 Image of a hibernating thirteen-lined ground squirrel from University of Minnesota Duluth researcher Matthew Andrews.
Thirteen-lined ground squirrels (Ictidomys tridecemlineatus) are really cute when they hibernate (above). During torpor bouts, their body temperature decreases to a few degrees Celsius and their metabolism drops by as much as 95% with heart rates ranging from only 3-10 beats per minute. These bouts of torpor are interrupted by periodic arousals every couple of weeks during which their metabolism increases as body temperature elevates to 37 degrees Celsius. What is so…
laelaps | June 16, 2010
A golden-mantled ground squirrel (Spermophilus lateralis), photographed in Bryce Canyon National Park, Utah. Though abundant at the Samwell Cave Popcorn Dome, California site during the Late Pleistocene, its numbers in the area decline at the beginning of the present Holocene epoch.
"One of the penalties of an ecological education", the naturalist Aldo Leopold once wrote, "is that one lives alone in a world of wounds." Few knew this better than he did. Despite becoming a celebrated advocate of wilderness for its own sake during the early twentieth century, Leopold began his career by…
edyong | July 19, 2009It seems like an uneven match. In one corner, the unassuming California ground squirrel (Spermophilus beechyi), 30cm in length. In the other, the northern Pacific rattlesnake (Crotalus oreganos), more than twice the length of the squirrel, and armed with hinged fangs that pack a lethal venom. But thanks to a cunning adaptation, the squirrel often gets an unexpected upper hand in this bout.
Ground squirrels live in a series of burrows that keep them out of reach of most predators. Snakes, however, have exactly the right body plan for infiltrating long sinuous tunnels, and it's not surprising…