The paper by Danny Rogers and others in Emu 105(2) entitled ‘Gull-billed Terns in north-western Australia: subspecies identification, moults and behavioural notes’, indicates they have trapped affinis terns in the Broome area in every month of the year.
I noticed in the latest issue of the journal Forktail a comment attributed to Danny Rogers that these birds are probably distinct at the species level, but genetic work has not yet been done.
Murray
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