Squirrel Group. - The Sciuroidea, which include the great group of squirrels, sousliks, marmots, &c., all comprised in the single family Sciuridae, differ from the sewellels in having large post-orbital processes to the skull (figs.
These lead on to the sousliks, Spermophilus (or Citellus), in which the incisors (as in the following genera) differ from those of all the squirrels in not being compressed.
In their slender build and :small size, prairie-marmots are much more like sousliks than marmots.
Sousliks feed on roots, seeds and berries, and occasionally on animal food, preying on eggs, small birds and mice.
Sousliks are eaten by the inhabitants of the Russian steppes, who consider their flesh an especial delicacy.