| Clue | Source | Date |
|---|---|---|
| The bird Sterna paradisaea (6,4) | ||
| Seabird that undertakes the longest migration in the animal kingdom | ||
| Maker of an over-70,000-kilometer annual round trip | Wall Street Journal | 20 Jun 2019 |
| Maker of an over-70,000-kilometer annual round trip | ||
| Black-capped migratory bird | The Telegraph General Knowledge | 10 Jun 2018 |