title: Letter: Woodpeckers and head injury.
mesh_terms: D000818:Animals; D001502:Beak; D001717:Birds / Q000502:physiology*; D001924:Brain Concussion / Q000517:prevention & control; D001930:Brain Injuries / Q000517:prevention & control; D006260:Head Protective Devices; D006801:Humans; D011482:Protective Devices