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- W2327967011 abstract "The need for objective criteria to determine the sex of molting ruffed grouse (Bonasa umbel- lus) in late summer (juveniles 13 weeks or older, and adults) led me to measure the length of a single barb of the central tail feather at a point 50 mm from the tip of the tail. In a sample of 1,518 birds whose sex and age were determined by plumage characteristics, I found that sex of individual grouse whose barb measurements fell outside the overlap (middle) size range could be determined by barb length, with an error of about 1-4 percent. Birds with barb length outside the overlap range comprised about two-thirds of the adults and one-half of the juveniles. Methods for determining sex and age of fully grown ruffed grouse by using the plucked length of the central tail feather, the shape of the outer three primaries of the wing, the diameters of primary 9 and the central tail feather, and the sheathing at the base of primaries 8 to 10 have been carefully authenticated in Wisconsin (Hale et al. 1954, Dorney and Holzer 1957). How- ever, molting adult and juvenile grouse in late summer have incompletely grown rec- trices, making it necessary to develop other criteria for determining sex. Palmer (1959) in Michigan noted that the eye patch of juvenile males had vivid to moderate pig- mentation while that of the females was colorless; he relied principally on this dif- ference in eye patch color to determine sex in molting juveniles. Palmer's eye-patch method for determining the sex of molting grouse was not published when I was con- ducting field studies on ruffed grouse in Wisconsin, but because the determination of relative color intensity is subjective, it appears useful to describe a more definitive method at this time." @default.
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- W2327967011 date "1966-07-01" @default.
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- W2327967011 title "A New Method for Sexing Ruffed Grouse in Late Summer" @default.
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- W2327967011 doi "https://doi.org/10.2307/3798758" @default.
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