Seasonal Changes in the Behaviour and Abundance of Pied Currawongs Strepera graculina and the Consequences for Seed Dispersal

Abstract

Pied Currawongs Strepera graculina congregate within the city of Armidale, N.S.W. in autumn and winter. In spring and summer they disperse to wooded habitats. Daily counts of Pied Currawongs and behavioural observations were made throughout 1988 in the city of Armidale. Pied Currawongs were resident all year. Relative abundance was c. 16 times higher during autumn and winter than during spring and summer. During the cooler months birds flocked together in the city. They had communal roosts in the surrounding forested areas from which they flew in the morning to feed in town, predominantly on fruit of garden ornamental shrubs. In the warmer months birds dispersed into forested areas and fed almost exclusively on invertebrates. These seasonal differences are discussed in relation to potential for seed dispersal of exotic plant species.