Codes that work in both the hunt view and the map view:
GLUCKYDUCK - many, many birds :)
DGGOLDENEGG - makes birds more curious,
              less likely to spook
Only the map view:
DGBIRDSEYE - show bird icons
DGWARP - allows hunter to teleport across map
Only the hunt view:
DGEGGSACT - stops gun wobble
DGFAMINE - makes birds look for a feeding site
DGPREDATOR - predator effect (like Trophy Hunter)
DGSNOWGOOSE - weather effects