i) From its long and very sharp pointed bill.
ii) From its rapid wing beats (like a Black-Winged Kite) in mid air.
iii) From its smaller size.
At times they do also rest on mudflats/shore but seldom seen them "floating" on debris in the sea.
If you could enlarge this photo you could see its fifth rectrices (p5) which is just like a thin filament. I don't see such feature in other terns so far (see photo below).
Little Tern in breeding colors (below)
HAPPY BIRDING !
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