Hello John,
In Canberra Bird Notes of June 2000, Ian Rowley reported on his colour-banding
study of a small population of Dusky Woodswallows out at Geary's Gap near Lake
George.
This is quite a long paper to appear in Canberra Bird Notes and rightfully
belongs in a journal with a wider readership, like Corella. I noted also in
Hanzab references to a paper of his in Proceedings of the International
Ornithological Congress 1976 which I haven't seen.
If you don't have older copies of Canberra Bird Notes, simply Google "Rowley
Dusky Woodswallow" and you'll find a PDF of the paper - the short answer to
your question is that groups of three are usually a pair + an offspring from
the previous year.
This sort of arrangement occurs elsewhere in the Artamidae - Grey Butcherbirds
occur mainly as pairs but occasionally as threes - Pied Butcherbirds often as
threes or sometimes fours and with Australian Magpies, that is where the story
really starts!!
Cheers
Graeme
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