What is a common symptom of apoplexy in birds?

Apoplexy in birds, often associated with a sudden vascular incident, can lead to uncontrolled muscle jerking or spasms due to severe disruption in blood flow, particularly in the cerebral area. This jerking is reminiscent of seizures and can occur as the bird's neurological functions are compromised. As a result, birds experiencing apoplexy may exhibit this uncontrollable muscle movement, which is a direct consequence of the underlying condition.

Other potential symptoms, such as loss of appetite or regurgitation of food, may occur in various other health issues among birds but are not directly indicative of apoplexy specifically. Likewise, foul-smelling breath is more often associated with digestive or oral health problems rather than with neurologically induced conditions characteristic of apoplexy.