title: Penguin waddling is not wasteful.
authors.affiliation: Integrative Biology Department, University of California, Berkeley 94720-3140, USA. tmgriff@uclink4.berkeley.edu
authors.forename: T M
authors.initials: TM
authors.lastname: Griffin
authors.forename: R
authors.initials: R
authors.lastname: Kram
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D001717:Birds / Q000378:metabolism / Q000502:physiology*; D004734:Energy Metabolism; D005684:Gait; D016138:Walking