Marsh Terns, Little and Saunder's Terns

Whiskered Tern-1
Whiskered Tern-1

Photographed in Mannar.

Whiskered Tern-2
Whiskered Tern-2

Photographed in Mannar.

Whiskered Tern-4
Whiskered Tern-4

Photographed in Mannar.

Whiskered Tern-1
Whiskered Tern-1

Photographed in Mannar.

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Whiskered Tern
(අලුපියා කන්ගුල්-ලිහිනියා)
Chlidonias hybrida

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

 

Seen in Mannar.

Doubtful identification
 
White-winged Tern-1
White-winged Tern-1

Photographed in Mannar.

White-winged Tern-2
White-winged Tern-2

Photographed in Mannar.

White-winged Tern-3
White-winged Tern-3

Photographed in Mannar.

White-winged Tern-1
White-winged Tern-1

Photographed in Mannar.

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White-winged 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.

Seen at Mannar.

Doubtful identification
 
Still to capture photo
Still to capture photo

Still waiting to get lucky and capture image.

Still to capture photo
Still to capture photo

Still waiting to get lucky and capture image.

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Saunders's Tern
(සෞන්ඩර්ස් මුහුදුලිහිනියා)
Sternula saundersi

Yet to capture image

Critically Endangered
 
Little Tern-1
Little Tern-1

Photographed in the outskirts of Matara.

Little Tern-2
Little Tern-2

Photographed in the outskirts of Matara.

Little Tern-3
Little Tern-3

Photographed in the outskirts of Matara.

Little Tern-1
Little Tern-1

Photographed in the outskirts of Matara.

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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.