Transmitted 20 Degrees Off Crossed Linear Polarized Light
This hair belongs to the group Ursus arctos. This group includes the Grizzly bear and the Kodiak bear in the United States.
Significance in the Environment:
Brown bear hair is about 50 micrometers wide from the root to near the tip. It has an often fragmented medulla showing occasional stretches of
uniserial ladder structure. The cuticle pattern is imbricate flattened and has a scale count of about 8 per 100 micrometers.
Brown bear hair has a refractive index along its length of about 1.56 and perpendicular to its length of about 1.55.
It has a birefringence of about 0.01 and a positive sign of elongation.
References with Photographs and/or Drawings
Hausman, Leon Augustus, "Structural charactreistics of the hair of mammals", THE AMERICAN NATURALIST, vol. 54, no. 635, pp.496-523,
Hausman, Leon Augustus, "Recent studies of hair structure relationships", THE SCIENTIFIC MONTHLY, pp. 258-277,
Glaister, John, A STUDY OF HAIRS AND WOOLS, Misr Press, Cairo, 1931.
(Click here for FBI site for Animal Hair Identification.)
Mayer, William V., "The hair of California mammals with keys to the dorsal guard hairs of California mammals", THE AMERICAN MIDLAND NATURALIST,
vol. 48, no. 2, pp. 480-512, 1952.
Stains, Howard J., "Field key to guard hair of middle western furbearers", JOURNAL OF WILDLIFE MANAGEMENT, vol. 22, no.1, pp. 95-97, January, 1958.
Mathiak, Harold A., "A key to hairs of the mammals of southern Michigan", JOURNAL OF WILDLIFE MANAGEMENT, vol. 2, no. 4, pp. 251-268, October, 1938.