Black-fronted Tern
Chlidonias albostriatus
Black-fronted terns are considered medium-small in size. Adults measure 28–30 cm in length, with a 65–72 cm wingspan and an average weight of 95 g. They have short orange bills, short orange legs, and a body that is dark grey above and light grey below with a white rump and a distinctive black cap. During the non-breeding season, the black cap recedes and becomes flecked with white.
ID text from Wikipedia, CC BY-SA 4.0
White-winged Tern
Chlidonias leucopterus
Adult birds in summer have short red legs and a short black bill (small and stubby, measuring 22–25 mm from the feathers, decidedly shorter than the head), a black neck (often with a pale gray back) and belly, very dark grey back, with a white rump and light grey (almost white) tail, which often looks 'square' in juveniles. The face is tinged yellowish. The wings, as the name implies, are mainly white. The inner wing is grayish with brown-tipped coverts.
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: Black-fronted Tern and White-winged Tern.