Sentence:  Out of this background of hunting and fishing , it was only natural that Roy first painted subjects he knew best : hunters in the field , fishermen in the stream , ducks and <WSD>geese</WSD> on the wing - almost always against a vast backdrop of weather landscape . 
Meaning of the word marked with <WSD> tags:  web-footed long-necked typically gregarious migratory aquatic birds usually larger and less aquatic than ducks