I am indebted to Michael Stupp for sending me scans of two stamps from the set, and agree with his identifications from these scans.

Little Egret (Egretta garzetta gularis)
Eurasian Spoonbill (Platalea leucorodia balsaci)
Grey Heron (Ardea cinerea)
Great Cormorant (Phalacrocorax carbo)
Long-tailed Comorant (Phalacrocorax africanus)?
Great White Pelican (Pelecanus onocrotalus)
Slender-billed Gull (Larus genei)?

Little Tern (Sterna albifrons)
Gull-billed Tern (Sterna nilotica)
Royal Tern (Sterna maxima)
Caspian Tern (Sterna caspia)
Bridled Tern (Sterna anaethetus)
Common Tern (Sterna hirundo)?

If anyone has any further news or views about this set, please let me know.