Hi Aonach_Eagach! My field guide (Simpson and Day 6th edition ) shows a dirty white for the underparts.... Of all the swallows it seems to be the one matching best (head, crown and neck match very well). I used to often see them by the water in Adelaide or Melbourne. Out of curiousity which field guide are you using?
DanielePralong
I was wondering if the underparts were grey or white in the photo, the field guide showed a much darker grey, but I'm going with your suggestion
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