Birds by chophia

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Across
  1. 3. a bird that only come in the winter
  2. 4. all different types of birds
  3. 5. when a egg is ready it's starts to ??
  4. 7. every bird sings this ?
  5. 8. when birds don't flap theirs wings and instead caught air with their wings
  6. 10. someone who studies birds
Down
  1. 1. when birds go to a different country they __
  2. 2. when I looked through my ???? I saw some bird eggs
  3. 6. when in danger birds go here ???
  4. 7. different species of birds have different ___
  5. 9. every bird has ???