Pair-bonds are retained from one season to the next.* Before laying, the male courtship-feeds the female, presenting small fish to her. Predators or humans entering a colony are repeatedly dived at."Are they here all year round?" the Frau Doktorin wondered.
"Of course they are!" I said, confidently though incorrectly. "There is a season, tern, tern, tern."
* Because one good tern deserves another.