Your birds may have worms even if you haven’t seen any worms in their feces. Common symptoms of internal worm infestation include: Pale comb and waddles, Weakness (droopy wing, struggling to stand), Lethargy (tiredness, keeps eyes closed), Constant puffed feathers with neck pulled in, Weight loss, Diarrhea (sometimes foamy), Death, Gasping, or coughing (for gape worms only)