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Hirundo neoxena
These two species are very similar. The barn swallow has a narrow blue-black upper breast band that the welcome swallow lacks. This bird also appears to lack that band.
It looks like a Barn Swallow (Hirundo rustica) - but there is another very similar species in Australia, the Welcome Swallow (Hirundo neoxena) - have to do some research to see how to differentiate them.