Word spiral

Starting from 1, fill in the grid in a clockwise direction with four-letter words. The last letter of each word becomes the first letter of the next to reveal the seven-letter key word in the shaded boxes. Keyword clue: Bird type

1. Couple 2. Violent disturbance 3. Melt 4. Volition 5. Speech defect 6. Shove 7. Snake sound 8. Opening for coins 9. Ballet skirt 10. Unfasten 11. Greek spirit 12. Cooker 13. Tidings 14. Settee 15. Too 16. Spoken, verbal