S339 * White-winged Tern or White-winged Black Tern * Witvlerksterretjie * Chlidonias Leucopterus

By Charles Lam from Hong Kong, China - New Friends, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=11003521

Sterretjie

Sources:

(*) https://en.wikipedia.org/wiki/White-winged_tern
(*) https://ebird.org/species/whwter
(*) https://search.macaulaylibrary.org/catalog?taxonCode=whwter