Several factors can cause seizures.

Convulsions or seizures may occur as spasms of the muscles in the wings, legs, head and body. Seizures may vary in characteristics. A minor seizure may be nothing more than a brief inability to perch, while a grand mal seizure may involve extreme motor activity. If your bird experiences convulsions, keep it calm and quiet. Make sure that it is not in any danger of injuring itself on any hard object. Call your veterinarian immediately.

Seizures may be indicative of such problems as poisoning, idiopathic epilepsy, infectious diseases, hyperthermia and metabolic disorders.