What did Lewis and Clark learn on the expedition?

During the journey, the expedition documented over 100 species of animals and approximately 176 plants. They also learned much about weather patterns, the landscape and made several maps of the areas they explored. They also collected a variety of Indian goods and gathered information on Indian languages and culture.

Unfortunately one thing they did not learn was how to catch and eat salmon while going down the Columbia River gorge in the season when the river was full of salmon, as a result of which they came very close to starvation when they ran out of beef and could find no deer or other animals considered suitable for food to hunt.