Large-billed Tern
Phaetusa simplex
The large-billed tern is large, short-tailed tern with a large yellow bill. It is around 38 cm (15 in) in overall length and weighs 208–247 g (7.3–8.7 oz). The crown and ear-coverts are black, the upperparts are grey, the secondaries, primary coverts, lores and underparts are white. The legs and feet are yellow. A non-breeding adult has a paler crown and forehead.
ID text from Wikipedia, CC BY-SA 4.0
Roseate Tern
Sterna dougallii
This is a small-medium tern, 33–36 cm (13–14 in) long with a 67–76 cm (26–30 in) wingspan, which can be confused with the common tern, Arctic tern, and the larger, but similarly plumaged, Sandwich tern. The thin sharp bill is black, with a red base which develops through the breeding season, and is more extensive (to fully red) in the tropical and southern hemisphere subspecies. It is shorter-winged and has faster wing beats than common or Arctic tern. Voice: The call of the roseate tern is a very characteristic chuwit, similar to that of the spotted redshank, quite distinct from other terns.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Large-billed Tern and Roseate Tern.