870 resultados para Rhinebeck Bird Club.
Resumo:
ser. 2, v. 10 (1907-1909)
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v. 4 (1874-1877)
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v. 2 (1870-1871)
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ser. 2, v. 1 (1881-1883)
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ser. 2, v. 9 (1904-1906)
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ser. 2, v. 2 (1884-1886)
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2
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v.2 (1854-1860)
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v.1 (1847-1853)
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3
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v.24:no.33(1943)
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v.51:no.3(1967)
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A change in bird density within a captive flock of Sicalis flaveola pelzeni (Sclater, 1872) affected the decision to join a group. Ruling out inter-individual differences and maintaining constant the size of a food patch, birds were found to fly more often to the food source and spend a longer time in its environs when kept in greater groups.
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n.s. no.21(1984)
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v.8:no.8(1941)