The young family remains united through the following winter, which accounts for finding at times from eight to a dozen in a den. In all the northern parts of their range they hibernate during the two to four months of severest cold weather, coming out sometimes during mild periods. When the season of hibernation ends the family scatters and mating begins. One solitary skunk was found in Canada hibernating in the same burrow, but in a separate chamber, with a woodchuck, evidently an unbidden guest. [Illustration: THE TRACKS OF A RUSTY FOX SQUIRREL AND FOX SQUIRREL The exaggerated pads of the squirrel foot are a strong feature of this track. It is typical in the pairing of the fore feet, much more so than that of the gray squirrel. There is never a tail mark in this track (see pages 547 and 561).] As in the case of their relatives, the common skunks are omnivorous, but feed mainly upon insects and rodents injurious to agriculture. They are known to eat great quantities of grasshoppers, besides crickets, cicadas, May beetles, wasps, and larvæ of many kinds. One killed in New Mexico had its stomach crammed with honey bees. Wherever possible they prey upon small rodents, as mice, wood rats, and small spermophiles. To these may be added ground-nesting birds and their eggs, lizards, turtle eggs, snakes, frogs, salamanders, fish, crustaceans, and numerous small fruits. Now and then they visit the farmers’ chicken yards with such disastrous consequences that in many country districts the animals are killed at sight. It is pleasing to record that a more intelligent view of their real value to farmers, through their destruction of farm pests, is rapidly gaining ground, and they are now being protected in many States. One of their worst traits is their destructiveness to breeding game birds, both upland species, and especially the waterfowl. Skunks walk on the soles of their feet instead of on their toes, as do so many mammals. The common skunks are wholly terrestrial and move with the deliberation of one without fear of personal violence or of having his dignity assailed. Long experience has taught them that the right of way is theirs. As they amble slowly along, the tail is carried slightly elevated, and when the owner is suspicious of attack, it is raised and the hairs hang drooping like a great plume, conspicuous and unmistakable. If the disturber still refuses to take the hint, a rear view is promptly presented and a discharge made that puts most enemies to flight. Some have thought that the odorous liquid is scattered by the long hairs of the tail, but in fact it is ejected in fine jets from two little tubes connected with the scent sacs on each side of the vent. [Illustration: A FULL SIZE RENDERING OF A FOX SQUIRREL TRACK Illustrations of the arrangement of this track when the animal is foraging and traveling are shown on page 581.]