Undetermined Fijian Grebe (Tachybaptus novaehollandiae ssp.)

This form is known only from subfossil bones that were recovered from deposits on the island of Viti Levu, Fiji. [1]

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This might be identical with the Solomon Islands Tricolored Grebe (Tachybaptus ruficollis ssp. collaris (Mayr)), which is the form closest geographically, or it might have been an endemic subspecies or species.

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References: 

[1] David W. Steadman: Extinction and Biogeography of Tropical Pacific Birds. University of Chicago Press 2006

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edited: 07.05.2021