Characteristic forms of this order in northern Asia are the marmots (Arctomys) and the pikas, or tailless hares (Lagomys).
The peculiar odour evolved by many rodents is due to the secretions of special glands, which may open into the prepuce, as in Mus, Microtus and Cricetus, or into the rectum, as in Arctomys and Thryonomys, or into the passage common to both, as in the beaver, or into pouches opening near the vent, as in hares, agoutis and jerboas.
- Skull of the American Marmot (Arctomys monax).
6) remarkably heavy, the molar teeth differing from those of Spermophilus and Arctomys by having three instead of two transverse grooves on their crowns.
Finally, we have the marmots (Arctomys), which are larger and more heavily built rodents, with short ears, more or less short tails and rudimentary or no cheek-pouches.
Of the Rodentia the most interesting and conspicuous is the marmot (Arctomys marmota), which lives in colonies close to the snow-line.
WOODCHUCK, the vernacular name of the common North American representative of the marmots (see Marmot), scientifically known as Arctomys monax.
MARMOT, the vernacular name of a large, thickly built, burrowing Alpine rodent mammal, allied to the squirrels, and typifying the genus Arctomys, of which there are numerous species ranging from the Alps through Asia north of (but including the inner ranges of) the Himalaya, and recurring in North America.
In America marmots are known as "wood-chucks" The Alpine Marmot (Arctomys marmotta).