A duck and a swan are both water birds with four letters.
A cormorant is a water bird.
King Bird. They swoop down to get their fish and fly back up. That's why on beer bottles it says kingfisher and shows a bird diving in the water
Crow
Tern
tree? :D
Dove or Crow
chat
Hawk
Rhea is a bird. It is 4 letters and starts with the letter R.
Hawk
bird
Tern , gull ,