striped hairy-footed hamster, the Djungarian hamster, the Siberian hamster, and Campbell's hamster. Campbell's dwarf hamster is commonly confused with the Djungarian hamster (Phodopus sungorus) due to some of the common names, such as the "Siberian hamster" also being used to describe the Djungarian hamster. Subspecies American biologist Ned Hollister described a subspecies in 1912: P. c. crepidatus : Found in the Altai Mountains of Siberia Description The size of Campbell's dwarf hamster varies depending on its location. For example, eight wild specimens examined from Mongolia showed an average head and body length of , an average hind foot length of long, with a tail length of . In captivity, they are proportionally larger, as commercial pet food and fruits provide more nutrition than food found commonly in the wild. The lips and cheeks have white fur and the rest of the fur around the face can be either grey or brown. A dark and narrow dorsal stripe runs along the center of the back from the nape of the neck to about above the tail. The surface of the hands and feet are white to ensure the animal stays warm in colder climates in countries such as Mongolia. In both the wild and captivity, Campbell's dwarf hamsters scent-mark around their territories using Harderian glands, skin glands located behind the ears. They use urine and feces for communication. Campbell's dwarf hamster is distinguished from the similar-looking Djungarian hamster by its smaller ears and no dark patch on the crown of its head, in certain colorations. The dorsal stripe of Campbell's dwarf hamster is narrower, shorter, and darker than that of the Djungarian hamster, and the fur on the stomach of Campbell's dwarf hamster is grey, but it is white on the Djungarian hamster. Campbell's dwarf hamster does not turn white in the winter and has a grey tint to its fur. It has a smaller interorbital breadth, but has a larger auditory bulla. Campbell's dwarf hamster is much less tolerant to lower temperatures than the Djungarian hamster. A laboratory experiment showed Campbell's dwarf hamster can resist temperatures as low as , where the Djungarian hamster can withstand temperatures as low as . Campbell's dwarf hamster reacts to lower temperatures by constantly exercising and tries to find a sheltered location, unlike the Djungarian hamster, which curls up and relies on its autonomic thermoregulation. Campbell's dwarf hamster has cheek pouches, which are an