A small, dainly-looking tern. Mantle and wings pale grey, while hindcrown, eye-stripe abd nape black. Breeding birds have black crown, nape and eye-stripe with white forehead patch, and yellow bill with black tip. In flight, note grey wings with dark outermost flight feathers.
Reference: Birds of Singapore by Yong Ding Li and Lim Kim Chuah

Woodlands Waterfront, 1 May 2024
f8 1/4000. ISO 1250, GM600 TC1.4x, MT190CXPRO3/GHFG1

Eagle Point, A1 APS-C mode, 13 Jun 2022
f8 1/3200. @600mm, ISO 800, MT190CXPRO3/GHFG1