ed and the long, black-tipped tail with two lines of hair is
laid out on the ground, and then on each side of it a leg is run out
which is nearly as long as the tail and is provided with blunt,
smooth, hoof-life nails; and, finally, the head and body are
distinguishable and the animal stretches out comfortably on its back
in the sand. The fine-skinned, hairless ears still hang limp, the eyes
are half closed and the short fore legs are crossed under the chin.

But now the animal gets on its legs by an elastic swing, and its ears
are raised and its eyes wide open, so that we can see that the latter
are large and dark, with long eyelashes. Then the jerboa raises
himself to his full height and playfully measures his cage by one
bound from corner to corner. Soon after, the fresh food receives due
attention, the animal either jumping toward it in rabbit fashion or
crawling slowly on all fours. When it has reached its goal it again
assumes the upright position, in which it is evidently most
comfortable, and begins to eat it in his own peculiar way; that is,
sitting on his hind legs he quickly seizes a piece of bread, turnip or
other food in his fore paws and conveys it to his mouth, apparently
indifferent to the nature of the food before him. He never takes
anything directly in his mouth; even the grass on a piece of turf that
I had given to him as an experiment was not eaten as it would have
been eaten by other animals, but was first plucked with the fore paws.
If we notice the position of the mouth, far back on the under side of
the head, we will understand that the jerboa could not take his food
in any other way. Besides this, nothing of special interest has been
observed in this nocturnal creature, but he, of course, lives more
regularly and quietly than if his mate had lived.

One who knows anything about the structure of animals' bodies need not
be told that the jerboa is a rodent. One glance at the peculiar shape
of his head would assure him of that. The form of the rest of its
body, especially its long hind and short fore legs, give unmistakable
proof that it is related to the jumping rodents; it belongs, in a wide
sense, to the family of the jumping mouse, the scientific name
(Dipodidea, two-footed) of which is very significant, as the very
short fore legs are usually carried close under the chin and are
scarcely noticeable when the animal is in its normal position, and are
of little use when it moves about. The hind