Probably either a 'Little' or 'Saunder's' Tern. Definitely a small one. I would plump for Saunder's because of the darker feet. Lucky to even get this image - so quick and agile.
@Bob Davies Great article. Link added to the UAE page, thanks.
Interesting to see the mention (again) of all black primary shafts of Saunders's Tern: some of our photos shows white shaft......
Impossible to say from that image, Bob: https://www.uaebirding.com/little-tern-versus
Thanks Tommy. Will hope for opportunities for better images.
This was interesting: https://www.britishbirds.co.uk/wp-content/uploads/article_files/V87/V87_N02/V87_N02_P060_066_A018.pdf
@Bob Davies Great article. Link added to the UAE page, thanks. Interesting to see the mention (again) of all black primary shafts of Saunders's Tern: some of our photos shows white shaft......