An analysis of the bird population in the vicinity of Rupert, Idaho

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Abstract:

A review of the bird population of a restricted area in the Vicinity of Rupert, Minidoka County, Idaho, based upon observations during the years 1919-1921, reveals the presence of 147 species of birds. This population is segregated into five classes as follows: Permanent residents, 19; summer visitants, 41; winter visitants, 18; regular migrants, 26; erratic in occurrence, 43. The large number of erratic occurrences is explained by the hypothesis that Rupert is between two major migration routes; hence the frequent appearance of stragglers. Also, the limited size of the area studied resulted in erratic presence of birds whose natural habitats were adjacent, but not strictly within the area. Comparison of the avifauna of Bannock County, Idaho, with that of the Rupert area revealed certain differences. Contrasts in size, topography and climate of the two areas (plus geographical location) probably explain these. Recent (1934) changes in the avifauna are noted. Some species have decreased in numbers due to the drought and to the intentional drainage of marshy areas; Black and Caspian terns have increased. Brewster Egrets, first observed in 1919, have established themselves during the past few years; the appearance of the White-faced Glossy Ibis is recorded.

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Reference Code: A35DAV01IDUS

Full Citation: Davis, W. B. 1935. An analysis of the bird population in the vicinity of Rupert, Idaho. Condor 37(5): 233-238.

Location: ANIMAL EF: BIRDS