JOURNAL ENTRY FIVE:

I'm perhaps never more humbled than when I'm witness to a commonality between humans and nature. Today I was fortunate to come upon a group of swans partaking of wapato in Boot Lake. I was delighted to watch them stomp around in the shallow water as they wrestled the wapato bulbs from the soil with their webbed feet, then dunked their heads to retrieve the prize.

It was then that I remembered Lewis and Clark's description of Cathlapotle women, wading sometimes up to their neck and loosening wapato bulbs with their feet. How interesting that this simple tuber that was the staple of a thriving town also helps sustain these birds that travel from so far away.

SOLVE THIS GEOADVENTURE MYSTERY:

From where do Ridgefield's swans come in the fall to feed on some tasty tubers? (Clue: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ , _ _ _ _ _ _)