Nature Notes From Crater Lake
Volume 21, 1955
The Giant Meadow Mouse
By Orville Page, Ranger Naturalist
The meadow mouse is rarely seen in our
park, especially in the daytime. On the morning of July 17, 1955, it was
my privilege to observe for a few moments two mice which I am reasonably
certain were giant meadow mice, Microtus richardsoni arvicoloides
(Rhoads).
My destination was Godfrey Glen and
Duwee Falls, in the steep-sided Annie Creek Canyon. A short distance
above Godfrey Glen, I crossed a very lush meadow area. On the upper
slopes of the meadow were some small springs which formed little streams
of water about six inches wide and three inches deep. As I approached
one of these streams, a splashing commotion was heard. This turned out
to be caused by the two giant meadow mice. They seemed frightened by my
intrusion and began to swim up the little stream. The mouse in the lead
swam along for about eight feet and disappeared into the grass. The
second mouse swam a little way and then hid under some grass that
drooped over into the stream. Only his head was visible. He apparently
felt insecure, and before my camera could be focused, he followed the
other mouse on up the stream and disappeared.
Meadow mice are often found around
water or damp places (Cahalane, 1947; Wallis, 1947). They are very good
swimmers. One meadow mouse in Michigan was observed to swim about eighty
feet, part of the way under water, to escape capture.
We have many little animals in the
forest that are not seen unless one gets away from the thickly populated
places. While out strolling through wooded areas, the lover of nature
probably enjoys most those moments when he encounters some forest animal
going about his daily living habits. These forest friends will continue
to live in their natural surroundings as long as the National Parks
maintain natural wilderness areas. The National Parks belong to you, as
an American citizen. Only your constant vigilance will keep them in
their present primeval setting.
Literature Cited
Cahalane, Victor H. 1947. Mammals of
North America. New York, The Macmillan Co. x, 682 pp.
Wallis, Orthello L. 1947. A Study of
the Mammals of Crater Lake National Park. Unpublished Master's thesis,
Oregon State College, Corvallis. 91 pp.