On the above three birds, the head patterns suggest Saunders’s; but the extent of the black bill tips, darker grey plumage tones and red legs on all three would perhaps favour Little Tern.
Little/Saunders’s Tern
On the above three birds, the head patterns suggest Saunders’s; but the extent of the black bill tips, darker grey plumage tones and red legs on all three would perhaps favour Little Tern.