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