Abstract
Seasonal changes in nesting vegetation, nest height, and nest success of the Bull-headed Shrike Lanius bucephalus were studied in Hokkaido, northern Japan from 1992 to 1995.Bull-headed Shrikes nested in dwarf bamboo and vine bushes in early breeding season; however, as the season progressed they moved their nest sites to a variety of deciduous shrubs as the foliage of these nesting plants increased.Nest height gradually increased throughout the breeding season, an observation that was attributed to seasonal changes in the use of nesting vegetation types.Bullheaded Shrikes showed a seasonal change of nest sites with the progress of plant phenology, and the change decreased the probability of predation.
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