I guess the case off the Brown Streaked Flycatcher at Sandfire Roadhouse would qualify as one of the biggest megas in Australian birding history (given its rareness in its native range).
It is a fascinating story if you haven’t come across it:
www.abc.net.au/news/2021-02-13/new-bird-species-found-in-australia-via-poo-detection/13137184
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