Birds Quiz

[John Fox]

Down to my last few but I'm stuck on these. All names of birds, but no indication of letters.
6. One has a cowl, another is round.
10. Filter about the point
14. A quiet image in an unusual guise.
20. Take a lttle time and be more careful Marian.
21. A piece of Attinghams river
23. Exchange greetings without the vocal arrangement.
27. Gem Gas
29. Old terminal judgement
30. Quiet Henry, take a rope.

Thanks in advance for any help.

[missesbell]

30. Phalarope

[missesbell]

21. Tern

[missesbell]

6. Hooded Robin

[JMR27]

10. sWift

[JMR27]

20. in the clue...careFUL MARian

[JMR27]

29. black cap

[JMR27]

23. I wonder if this is egret? exchange, i.e. anagram of greetings minus "sing" / vocal arrangement. Although a vocal arrangement would be song rather than sing

[JMR27]

27. stonechat

[missesbell]

14. Is almost Ptarmigan but I can't quite work it out !!

[John Fox]

Many thanks for all of your efforts. I will go with your answers.