Abstract
successfully California gulls. Moffit (1942) succeeded in marking grouse with dye dissolved in 50 per cent water and alcohol. He found that a concentrated dye in this solution penetrated quickly, and did not fade perceptibly during a period of two months' exposure to desert sunlight or rain. Evans and Holdenreid (1943) in their study of the Beechy ground squirrel, tested several dyes for marking these rodents. Of those tested, black was visible for the longest period, but nearly all faded beyond recognition in 30 days. Leopold (1938) used dyed feathers for feather marking released birds. He collected the feathers, washed them in vinegar, and boiled them in a dye solution for 15 minutes. The feathers were fastened to the bird in the approved fashion after the dyeing process was completed. This treatment gave a color recognizable for six months, but if unwashed or if boiled for a shorter time, they faded within two months. Whatever marking technique is used for study purposes, it must be recognizable at a distance of from 100 to 600
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