Wing beating tremor may be present in case of Wilson’s disease. It is characterized by posture induced shaking of the arms. The tremor is low in frequency and high in amplitude. In addition, generalized hypertonia may be demonstrated in Wilson’s disease. Reference: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6353510/ Video source: https://www.youtube.com/watch?v=_LJXgDQV2Vo