Co-operative breeding by Black-faced Woodswallows Artamus cinereus
From 1973 to 1976, I studied Black-faced Woodswallows Artamus cinereus
in the wheatbelt of Western Australia, where the species is resident all the year round. By 1975 all the birds in one group were individually colour-banded and their contributions at four nests were recorded during 68 hours of hide-watches. All birds, presumably of both sexes, took part in incubating the eggs, and in brooding and feeding the nestlings.
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