Abstract
Primary lengths of juvenile spruce grouse (Dendragapus canadensis) in New Brunswick and Ontario were measured to evaluate a method for determining juvenile age (McCourt and Keppie 1975). The Alberta growth curve for juvenal primary 7 (J7) is accurate for New Brunswick and Ontario but the Alberta growth curves for juvenal primary 9 (J9) and postjuvenal primary 7 (PJ7) are not accurate for those regions. A new growth curve for J9 is presented that can be used for birds in New Brunswick and Ontario.

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