Word spiral

1. Rigid toothed device

2. Second Greek letter

3. Highest point

4. Christmas

5. Rotate

6. Invalid

7. Jump

8. Meat spread

9. Compass point

10. Hire car

11. Unit of length

12. Ring of light

13. Line in darts

14. Gaelic

15. Finishes

16. Brogue, say

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 sevenletter key word in the shaded boxes. Keyword clue: Mythical bird