| Clue | Source | Date |
|---|---|---|
| *Annual upriver migration | LA Times Daily | 04 May 2025 |
| Boon for grizzly bears | New York Times | 13 Sep 2024 |
| Food source for grizzly bears | LA Times Daily | 25 May 2024 |
| Aquatic migration sometimes aided by a fabricated ladder | New York Times | 01 May 2023 |