Of all the living creatures in this sleeping valley, Thor was the busiest.
He was a bear with individuality, you might say. Like some people, he went
to bed very early; he began to get sleepy in October, and turned in for his
long nap in November. He slept until April, and usually was a week or ten
days behind other bears in waking. He was a sound sleeper, and when awake
he was very wide awake. During April and May he permitted himself to doze
considerably in the warmth of sunny rocks, but from the beginning of June
until the middle of September he closed his eyes in real sleep just about
four hours out of every twelve.

He was very busy as Langdon began his cautious climb up the gully. He had
succeeded in getting his gopher, a fat, aldermanic old patriarch who had
disappeared in one crunch and a gulp, and he was now absorbed in finishing
off his day's feast with an occasional fat, white grub and a few sour ants
captured from under stones which he turned over with his paw.

In his search after these delicacies Thor used his right paw in turning
over the rocks. Ninety-nine out of every hundred bears--probably a hundred
and ninety-nine out of every two hundred--are left-handed; Thor was
right-handed. This gave him an advantage in fighting, in fishing, and in
stalking meat, for a grizzly's right arm is longer than his left--so much
longer that if he lost his sixth sense of orientation he would be
constantly travelling in a circle.

In his quest Thor was headed for the gully. His huge head hung close to the
ground. At short distances his vision was microscopic in its keenness; his
olfactory nerves were so sensitive that he could catch one of the big
rock-ants with his eyes shut.