. Il campo Canadese-naturalista. Storia naturale; Sciences Naturelles. 2005 Lumsden: Grouse ibridazione su Isola Manitoulin 509. La figura 1. Approssimativamente la velocità di avanzamento della prateria di polli in Michigan settentrionale e Manitoulin Island, Ontario. Anche se non gli esemplari del nord della Sharp-tailed Grouse dall'isola sono stati conservati dal 1932- 1933 irruzione, vi è la conferma del file di superstite del dipartimento del gioco e della pesca1 che hanno fatto raggiungere Manitoulin Island nel 1932. In una lettera datata 20 febbraio 1933 J. M. Parchi, sovrintendente a North Bay, la scrittura di Sharp-tailed Grouse

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. The Canadian field-naturalist. Natural history; Sciences naturelles. 2005 Lumsden: Grouse Hybridization on Manitoulin Island 509. Figure 1. Approximate speed of advance of Prairie Chickens in northern Michigan and Manitoulin Island, Ontario. Although no specimens of Northern Sharp-tailed Grouse from the Island were preserved from the 1932- 1933 irruption, there is confirmation in the surviving files of the Department of Game and Fisheries1 that they did reach Manitoulin Island in 1932. In a letter dated 20 February 1933 J. M. Parks, Superintendent at North Bay, writing of Sharp-tailed Grouse, "On November 5th last it was estimated that several hundreds of birds alighted in the town of Elk Lake, and at the present time small flocks are to be found in the vicinity of North Bay, Sudbury and the Manitoulin Island." He wrote a second letter on 6 March 1933, "Flocks have again been reported in the vicinity of Webbwood and the Manitoulin Island." During this irruption Northern Sharp-tailed Grouse spread over an area of approxi- mately 100 000 square kilometres to the south of their normal breeding range in Ontario. That did not include the area south of the French and Mattawa Rivers where only a few flocks appeared, nor did it include the area the birds occupied in Quebec. In the Sault Ste. Marie area, a flock of Sharp-tailed Grouse appeared near the school on Lot 11 Concession A of St. Joseph's Township during the winter of 1932 according to Murray Smith (Lands and Forests, per- sonal communication). His brother, F. B. H. Smith, saw a flock of "Prairie Grouse" (species uncertain) about a hundred strong, in the same place in 1935. Snyder (1935) listed seven observations of young birds or nests with eggs reported from south of the normal breeding area in the summer of 1933. Although there may be an error in any one of these reports, Sny- der pointed out, that the aggregate provides "un- questionable evidence that the species nested in te

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