Our expert says:
If the beak is overly long, but not skew, this may indicate liver disease or certain vitamin deficiencies. A skew beak will overgrow as it is not wearing down normally. If the beak has formed a 'double beak', this may be due to insufficiently rough perches (for filing the beak against) or vitamin A deficiency. If a liver disease is suspected, there are many causes including bacterial infections, psittacosis, fungal toxins in the diet etc. I suggest you get the bird to an experienced avian veterinarian to have it examined - a thorough dietary history should be taken, and certain blood tests can be performed to evaluate liver function. An x ray can also be of help in evaluating the liver size, and endoscopy can be performed for liver biopsies if indicated.
Dr Willemien van Wyk
Bird and exotic animal veterinarian
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