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The tweeting of a baby bird is a signal that it wants to be fed. In most species, baby birds eat regurgitated food that they are given by their parents, so anything that you feed a baby bird must be very easily digestible.
Egrets, aka cowbirds, eat insects. The young birds are fed by their parents, just as other bird species are. The parents feed on the insects, then regurgitate the food into the baby bird's open mouths. That is why a baby bird will raise its head and open its mouth wide when they sense, feel, or see movement above them.
baby birds get adult mites from their parents in the nest
The baby bird will need food Immediately. However it is unlikely that you will be able to feed it enough - it needs it parents.
I think you might be thinking of abandoned, which means left behind. The baby bird was abandoned by its parents.
Must be fed by the mother bird
Yes, it's OK to place a fallen baby bird back in the nest. It's a myth parent birds will kill babies that have human scent on them. The parents will care for it if the baby bird isn't ill. Baby birds often end up out of the nest because parent birds "kick" them out due to illness. Seems cruel, but it's how Mother Nature works.
the baby bird is called nestling
No. A bird's beak is not like people losing their baby teeth and having their adult ones grow in. The bird's beak grows with the bird, and it has the same beak for life.
if you are asking about the bird, it sees one or both of it's parents
well if that baby bird is your pet and it can nearly fly,....... no. Trust me i have a baby bird for a pet.
When a baby bird is fed by it's parents, most of the time it is with regurgitated food. This food has already started the digestive process, so the baby is receiving all the fluids it needs from it's parents, and the foods they provide. If you find a baby bird, and can not find the nest near by, do not try to give it any liquids. They can inhale the liquids and either drown or develope pneumonia. There are many sites for how to help, and feed baby birds, I've listed some below.