Greater Crested Tern
Thalasseus bergii
The greater crested tern is a large tern with a long (5.4–6.5 cm or 2.1–2.6 in) yellow bill, black legs, and a glossy black crest that is noticeably shaggy at its rear. The breeding adult of the nominate subspecies T. b. bergii is 46–49 cm (18–19.5 in) long, with a 125–130 cm (49–51 in) wing-span; weight 325–397 grams (11.5–14.0 oz). The forehead and the underparts are white, the back and inner wings are dusky-grey. In winter, the upperparts plumage wears to a paler grey, and the crown of the head becomes white, merging at the rear into a peppered black crest and mask.
ID text from Wikipedia, CC BY-SA 4.0
Little Gull
Hydrocoloeus minutus
The little gull has a body length of 24 to 28 cm (9.4 to 11.0 in) and a wing span of 62 to 69 cm (24 to 27 in), making it the smallest gull species in the world. The adults in breeding plumage have a black hood, dark red bill, bright red legs, and sometimes a rosy flush to the underside. In non-breeding plumage the adults have a black cap and spot on the ear, white underparts, a black bill and the red on the legs is duller. In all plumages the adults have a pale grey back and upperwings with white primaries contrasting with very dark grey underwing.
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: Greater Crested Tern and Little Gull.