Transmitted 20 Degrees Off Crossed Linear Polarized Light
                
Definition/Function:
                This hair belongs to the group Rangifer tarandus. This group includes the North
                  American Caribou and the Eurasian Reindeer.
                
                Significance in the Environment:
                Characteristic Features:
                Caribou hair is about 100 to 150 micrometers wide from the root to near the tip. It has
                a lattice type medulla that nearly fills the hair.
                The cuticle pattern is imbricate flattened and has a scale count of about 7 per 100
                micrometers. The scales are polyhedral, much wider than
                long. Caribou 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.
                
Associated Particles:
                References:
                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.
                FBI site for Animal Hair Identification:
                http://www.fbi.gov/hq/lab/fsc/backissu/july2004/research/2004_03_research02.htm
                Keys Only
                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.