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Marsh Terns, Little and Saunder's Terns

Whiskered Tern
(අලුපියා කන්ගුල්-ලිහිනියා)
Chlidonias hybrida

Based on the size of the beak and the black on the head extending to the nape but does not drop below the eye, I believe this is a Whiskered Terns.

 

Images 1 to 4 are from Mannar. Images 5 to 9 are from the outskirts of Sigiriya.

Doubtful identification
Whiskered Tern
White-winged Tern / White-winged Black Tern (සුදුපියා කන්ගුල්-ලිහිනියා)
Chlidonias leucopterus

Based on the fact that the black eye-strip drops behind the eye and the dull orange legs, I believe this is a White-winged Tern. This is a difficult identification as the smaller Tern's have similar features. If someone thinks I have made an incorrect identification, please let me know.

First photographed at Mannar (images 1 to 3). Images 4 and 5 are from Panadura beach.

Doubtful identification
White-winged Tern
Saunders's Tern
(සෞන්ඩර්ස් මුහුදුලිහිනියා)
Sternula saundersi

Yet to capture image

Critically Endangered
Saunders's Tern
Little Tern
(පුන්චි මුහුදුලිහිනියා)
Sternula albifrons

Although I only saw them flying around without settling down, based on the size, the white forehead and wing patterns, I'm fairly certain this is a Little Tern. Seen at a marsh on the outskirts of Matara.

Little Tern
Black Tern
Chlidonias niger

Yet to capture image

Black Tern
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