ID Query from Birds seen at High Island, Texas (1 Viewer)

Hello All,
Last weekend(Apr 23 and 24) I went to see the spring migration of birds at High Island. I saw below birds but unable to identify the same. Any help is really appreciated.

Photos taken on April 24, 2016.

1. Are both birds in photos Short-Billed Dowitchers? Anahuac national wildlife refuge, Texas

https://3.bp.blogspot.com/-K7IJfYftpSc/VyL50_XOJfI/AAAAAAAARMc/g5o93oeVpjYtnjGLvBkWuR4yAQJjn8KswCLcB/s1600/DSC_5759.JPG

2. Not sure. taken at Anahuac national wildlife refuge.
https://3.bp.blogspot.com/-B2peVfWg...Bzg1e4_uQKGKddWjlJD2cQCLcB/s1600/DSC_5765.JPG

3. Hawk ID, seen at Boys Scout Woods Sanctuary, High Island, Tx.
https://1.bp.blogspot.com/-w3pJhjNZ...upY_vYISN947R1ReNSecHwCLcB/s1600/DSC_5828.JPG

4. Dunlins? Seen at Bolivar flats shorebird Sanctuary, Tx
https://3.bp.blogspot.com/-2JWaQusX...wI2jXZ9HB_0gd6yyGYx57gCLcB/s1600/DSC_6045.JPG

Regards,
Srinivas.

Agree with Dunlin for 4.

1) Look to be Short-billed based on pattern of white edges to scapulars (see http://www.surfbirds.com/ID Articles/dowitchers1005/dowitchers2.html). Silent dowitchers are tough, expect as juveniles or when in complete alternate plumage

2) Semipalmated Sandpipers

3) Broad-winged Hawk

4) Dunlin

Andy

Thank you Andy and Pete for helping with the ID.