By Mdf - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=2050840
Sterretjie
Sources:
(*) https://en.wikipedia.org/wiki/Caspian_tern(*) https://ebird.org/species/caster1
(*) https://search.macaulaylibrary.org/catalog?taxonCode=caster1