Feather-plucking
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Feather-Plucking occurs in many bird species world-wide for a variety of reasons. Wild birds pluck feathers to maintain appropriate body temperature.[citation needed] Domestic birds and pets can also display forms of this behavior for both thermal or psychological reasons.
Birds kept in cages may be showing emotion through the feather-plucking habit, possibly owing to lack of appropriate environmental stimulation. Feather-plucking may indicate the bird feels neglected, sad, bored, or inappropriately expressing joy. Alternatively, feather-plucking may be due to a feather disease, an itchy skin disease or another physical problem.
It is possible that veterinary treatment or an improved and more stimulating environment may help a bird suffering from feather-plucking.