What makes a dropping?
Droppings actually consist of three recognizable parts: feces, clear urine and a white urine called urates. You'll want to get a good idea of what each part looks like normally for your bird and monitor all three daily so you can report any serious changes to your vet. Generally, the feces part of the dropping should be green or brown. It should be solid and coiled like a snake, segmented or in pieces. The urine portion of the stool should be clear and watery. Urates should be an opaque white-beige crystalline material. Sometimes the urine and urates are mixed, creating a cloudy-looking material, but usually they are separate.
Not all changes in droppings indicate a health problem. For instance, different types of food can change the color of your bird's poop. Birds that favor pellets of a certain color may release feces that have taken on the same tinge. (The feces of birds who eat ordinary pellets are usually rust colored.) Strawberries may introduce a slight reddish color and blueberries, cherries and cranberries can turn fecal matter black.
Watery foods can make your bird's droppings appear looser than usual. Sometimes droppings may even be all liquid. However, as long as any fecal matter remains solid, watery droppings are not diarrhea. They are perfectly normal instances of polyuria, an increase in urine. In fact, long-time bird owners who feed a healthy varied diet including not only pellets but moist foods such as fresh vegetables, fruits, beans, pastas and cooked grains know that extra-wet droppings are the norm - they mean the bird is well-hydrated. You can expect to see an increase in urine also if your bird receives a scare or experiences stress, such as during a veterinary exam.
For more information go to:
http://www.parrotchronicles.com/septoct2002/droppings.htm