Abstract
Variations in fledging body weight and wing length of the Russet Sparrow Passer rutilans were studied in two different types of habitats, shelter belt and isolated forests, in south-eastern Hokkaido, Japan, during the breeding seasons of 1995 and 1996. Although neither body weight nor wing length at hatching were significantly different between the shelter belt and the isolated forests, body weight at fledging was heavier in the isolated forests than in the shelter belt. This differences in fledging body weight might be explained by the presence of a greater food supply in the isolated forests than in the shelter belt.
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