Reveal birds
Press C while playing to show birds as yellow on the map screen and red on the field screen. Then press F after they are shown to flush them out.

Get credit for more birds
Simply shoot a bird. Now shoot it again as it is falling. At times the game will credit you with more than one bird.

Reveal cubbies
Simply type ughc while your in map view.

Reveal dog's smelling range
Simply press C while your in field view. The green circle represents your dog's smelling range.