Clue | Source | Date |
---|---|---|
Structure that allows aquatic animals to climb in a river | ||
Structure that creates a path for upstream migration, and a hint to hidden words in four long Down answers | The Washington Post | 24 Dec 2020 |
Structure that creates a path for upstream migration, and a hint to hidden words in four long Down answers | LA Times Daily | 24 Dec 2020 |
Structure for spawning salmon |