My favourite book, The Field Guide to the Birds of Australia by Graham Pizzey and Frank Knight, makes the following note in regard to the habitat of the White-breasted Woodswallow.
‘Dead or live trees beside/over rivers, lakes, wetlands, coasts, islands, mangroves, paperbarks, river red gum forests, jetties, channel-piles’.
There is certainly no mention of open plains country, so I was most surprised to encounter a family group along a roadside on the Moolort Plains yesterday. This species is a regular summer breeding visitor to Cairn Curran and nearby reaches of the Loddon River. This is the first time in my memory that I’ve observed them away from the habitat described above.