The American Ornithological Society has a proposal to treat Gygis microrhyncha as a separate species from White Tern G. alba.
See page 32 in this link:
https://americanornithology.org/wp-cont ... 2023-D.pdf
3 species of White Tern [alba, candida, microrhyncha] proposed
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Michael Szabo
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Proposed split of Gygis microrhyncha + G. alba
My new book 'Wild Wellington' published by Te Papa Press is now available online: https://tepapastore.co.nz/products/wild ... o-o-te-ika