Lewis and Clark and Birds

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Across
  1. 2. Word that describes both a bird and a direction on a compass
  2. 5. American songbird, Batman's sidekick
  3. 7. Mountain range that Lewis and Clark crossed at Lemhi Pass
  4. 9. This era gave Jefferson his ideals of scientific inquiry and the pursuit of knowledge
  5. 13. Bird that symbolizes the United States. Lewis and Clark saw one
  6. 15. Body of water that Lewis and Clark traveled up
  7. 16. Artist who came with Prince Maximilian
  8. 17. Lewis had a type of this bird named after him
  9. 18. Lewis and Clark saw several of this type of bird, can be sharp-tailed, sage, and blue; rhymes with house
Down
  1. 1. Avian home often found in trees made of twigs
  2. 3. Owl that the Corps of Discovery saw two of
  3. 4. Who on the expedition was more the naturalist, in charge of observing birds and other animals
  4. 6. The study of birds
  5. 8. State bird of North Dakota, seen by Lewis and Clark
  6. 10. Clark had a type of this bird named after him
  7. 11. Some of these birds were sent back to Washington alive
  8. 12. Hobby of looking for avian creatures in the wild
  9. 14. Impoverished ambition,smallest North American nightjar, nocturnal