1. Abnormal behavior: Birds often show abnormal behaviors before getting sick or dying, such as loss of appetite, decreased activity and sitting still.
2. Dyspnea: Birds have abnormal breathing, such as shortness of breath, wheezing and mouth breathing. , may mean physical problems.
3. Uneven feathers: Birds may have unkempt, untidy and tarnished feathers before they become seriously ill or die.
4. Loss of appetite: A bird's sudden loss of appetite or complete cessation of eating may be a sign of physical problems.
5. Abnormal excreta: The color, shape and smell of bird excreta have changed obviously, which may be a sign of physical discomfort.
6. Voice change: The voice of birds becomes abnormal or lowered, which may indicate that there is something wrong with their health.
7. Abnormal posture: Before getting sick or dying, birds may show abnormal posture, such as bowing their heads, lying down and drooping their wings.
Please note that these signs are not absolute, but common manifestations, and the specific situation needs to be comprehensively judged by combining the living environment, diet, maintenance and other factors of birds.