The book North American Fauna 73 was written by author U.S. Fish And Wildlife Service Here you can read free online of North American Fauna 73 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is North American Fauna 73 a good or bad book?
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Spring migrants arrive in the Western Upland 1-5 May and peak popu- lations occur 15-20 May. Spring migrants arrive in the Northern Highland by 10 May (earliest— 26 April 1957, Burnett County; Lound and Lound 1957c), reaching peak populations 20-25 May. Fall migration begins in late July. Peak movement in the Northern Highland occurs 5-20 August and de- parture is by 10 September. Peak fall migration in the Western Upland occurs 15-30 August and departure is by 15 September (latest— 1 December ...1971, Washington County). Nesting Season Distribution: Common nesting species in the Western BIRDS OF THE ST. CROIX RIVER VALLEY 155 Upland and Central Plain, uncommon and local in the Northern Highland. Breeding Bird Survey data (Table 7) suggest that the region of greatest abundance is the Central Plain. Unfortunately, the Hudson BBS route does not traverse large expanses of northern oriole habitat as this species is a common breeding bird in that area. A recent increase in breeding popu- lations is suggested by Jackson's (1943) statement that this species was "nowhere common in the region except at St.
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