Join Date: Nov 2017
Location: London, UK
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Thank you for all your helpful suggestions, Mr Peepers.
We have checked under the feathers on his right shoulder several times and it looks exactly the same as his left shoulder. There are no obvious signs of cyst, ingrown feather or damaged skin.
We live in the UK and do have our central heating on at this time of year, but our parrot displays this behaviour at any time of the year, so it does not seem to be temperature or humidity/dryness related.
Our adorable caique grooms and looks after himself very well and has never pulled out his feathers. His nibbling, with squabbling noises, only takes place whilst he is actively playing and seems to be over-excited. He never does it whilst he is sat still eating, watching the world go by, or dozing.