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- W2052148336 abstract "From spring 1975 through early summer 1987 (except for springs 1980 and 1984) a population study of the Black-eared Kite Milvus migrans was conducted on the wooded slopes immediately adjoining a residential portion of Chuo Ward, Kobe, Japan. The study area, about 4 km by 2 km, consists of a dozen roughly parallel NW-SE valleys sloping toward the city and the sea beyond it.Observations in the non-breeding season (October to February) around sunset time revealed an uneven pattern in the number of gathering kites. A westward shift in the location of the main roosting area might have been related to competition for the roosting sites from crows, especially the Thick-billed Crow Corvus macrorynchos.Black-eared Kite pairs built nests in 65 trees (29 of them conifers) at an average height of 10 m. Some nests were used 2-4 times, so research was conducted at 94 nests. From a high of 15 nests in 1978, the number of nests gradually decreased to a low of only 3 nests in 1987.During the last 5 years of the study, eggs disappeared from at least 18 of the 34 nests, and a half eaten nestling was found in another nest. At most 4 fledglings were raised in the 34 nests. It is considered that predtion by the Thick-billed Crow is the major cause of nest failure and population decline of the Black-eared Kite." @default.
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- W2052148336 date "1987-01-01" @default.
- W2052148336 modified "2023-09-25" @default.
- W2052148336 title "The Demise of the Black-eared Kite Milvus migrans in Kobe, Japan" @default.
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- W2052148336 doi "https://doi.org/10.3838/jjo.36.79" @default.
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