Cadmium is toxic in extremely low levels. Because of this tests may fail to pick up a poisoning due to cadmium. Signs of cadmium toxicity are very similar to mercury and include bloody diarrhea, convulsions, and disorientation. Lead most commonly effects the gastrointestinal tract and neurological system, leading to signs associated with these organs. Diarrhea and bloody urine are common.
Diarrhea is often green in color.
Cockatiels often show somewhat vague signs, including fluffed appearance, loss of appetite, diarrhea, and vomiting. Surprisingly, paralysis of one leg may be the only presenting sign of lead poisoning, although paralysis of both legs is more common. Convulsions and seizures may occur. Excesses will cause signs of heavy metal poisoning similar to lead. A diagnosis of heavy metal poisoning is often a challenge because owners are rarely aware of exposure to heavy metals.