There could be several reasons why a baby bird might constantly cry, even after being fed. Some of the common reasons include:
Hunger: Baby birds have high metabolic rates and need frequent feedings. If they are not getting enough food or are not being fed on time, they will cry to communicate their hunger.
Thirst: Along with food, baby birds also need water. Dehydration can cause distress and lead to constant crying.
Discomfort: Baby birds are sensitive to their environment. If they are too hot or too cold, experiencing pain, or uncomfortable in any way, they may cry to express their discomfort.
Loneliness or Stress: If a baby bird has been separated from its parents or siblings, it may feel lonely and stressed. In the wild, baby birds are dependent on their parents for protection and care, so being alone can be distressing for them.
Insecurity: Some baby birds may feel insecure or scared, especially if they are in an unfamiliar environment or have been handled by humans.
Illness or Injury: If a baby bird is sick or injured, it may cry as a sign of distress and pain.
Attention-seeking: Like human babies, baby birds may cry to get attention and care from their caregivers.
If you encounter a baby bird that seems distressed and constantly crying, it's essential to approach with caution, as they are fragile creatures. If you suspect the bird is in distress, the best course of action is to contact a local wildlife rehabilitator or a bird expert. They have the expertise and knowledge to properly care for and assess the needs of the bird. Attempting to care for a baby bird on your own without proper knowledge and training could do more harm than good.