Wren & Sparrow 3/29/2021

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Across
  1. 2. The only mammal that can fly
  2. 4. Alosa sapidissima
  3. 6. Most dangerous bird in the world
  4. 7. Linear flight formations of migratory birds
  5. 8. Kill billions of birds per year
  6. 11. Weighs more than the bird's skeleton
  7. 12. Only bird with nostrils at the end of it's beak
Down
  1. 1. 2/3 of the world's birds are found here
  2. 3. The numbers of fingers on each wing
  3. 5. The slowest flying bird
  4. 6. Used to detect carbon monoxide in coal mines
  5. 9. Hummingbird with bill longer than it's body
  6. 10. Largest nest builder
  7. 11. Mates for a lifetime