Feathers and flight

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Across
  1. 1. Feathers helped animals stay warm, attract ________, and eventually fly.
  2. 6. Because of this, Anchiornis probably couldn’t ________.
  3. 9. Anchiornis had feathers on both its arms and ________.
  4. 11. Feathered dinosaurs may have evolved flight by jumping from tree to ________.
  5. 12. A small movable ________ was found in Anchiornis fossils.
  6. 13. This bone helped Anchiornis fold its arms to its ________.
  7. 14. The difference in air ________ allows birds to fly.
  8. 15. These feathers were similar to ________ bird feathers but had the same shape on both sides.
Down
  1. 2. Scientists believe feathers evolved because they provided certain ________.
  2. 3. One side of the feather is thin and hard, while the other side is long and ________.
  3. 4. Modern birds use the same bone to pull their wings toward their ________ as they fly.
  4. 5. Paleontologists study theropod dinosaurs to find ________ about the origin of flight.
  5. 7. Anchiornis is a 150-million-year-old ________.
  6. 8. Birds lift themselves by turning their ________ at a particular angle.
  7. 10. A bird’s feathers are not the same ________ on each side.