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Your bird could be suffering any number of ailments, from a cage mate who is plucking it, to French moult. If you have ruled out that another bird is plucking the feathers, take it to an avian veterinarian to help uncover the cause.
I can't be completely sure because I haven't seen your bird. But, if your cockatiel is losing feathers on his body, he is probably plucking them out himself out of stress or depression. If he is losing feathers on his head, then another bird is probably preening him too aggressively. Either way, if it doesn't stop soon, I suggest you check with your vet on how to help him. :)
Plucking can be from many reasons... also if oregano oil has got a good side.... remember it has god its bad side. Go to vet maybe he can help you. Also search informations from experts :)
The only 2 reasons your parrot loses feathers is by molting or if it's in distress. Some birds may experience severe molting, but it is uncommon. If the parrot is in distress it can be for a variety of reasons that she is plucking. See an avian vet for solutions or visit an avian specialty store for over the counter products that may help.
Down feathers keep them warm Counter feathers help them fly
the tail has flight feathers and the flight feathers help a bird to fly.
To conserve feathers, you can do so by putting them in a ziplock bag, in the freezer. This can help to keep the colors bright, and can also help keep the feathers fluffy.
they help them flyswiftly
A kiwi's feathers are shaggy and hairlike, and do not have the "hook and barb" system of flighted birds. Flighted birds have feathers where all the strands are linked via tiny "barbules". These help to keep the feathers stiff, and help with flight.
Warm it!
Feathers help in insulation and endothermy .
It will not be able to fly with no feathers. Feathers keep a bird warm. If its feathers are gone it will die of cold. Most importantly feathers help a bird to escape from predators.