Biomechanics: early birds surmount steep slopes.
Hutchinson
John R
JR
D000818:Animals; D005075:Biological Evolution; D001696:Biomechanical Phenomena; D001717:Birds / Q000502:physiology*; D005426:Flight, Animal / Q000502:physiology*; D006614:Hindlimb / Q000502:physiology*; D008954:Models, Biological; D012420:Running / Q000502:physiology*; D014921:Wings, Animal / Q000502:physiology*