Hominid ancestors may have knuckle walked.
Stokstad
E
E
D000818:Animals; D005075:Biological Evolution; D001842:Bone and Bones / Q000033:anatomy & histology; D005542:Forearm / Q000033:anatomy & histology; D006071:Gorilla gorilla / Q000033:anatomy & histology / Q000502:physiology; D015186:Hominidae / Q000033:anatomy & histology* / Q000502:physiology; D006801:Humans; D002679:Pan troglodytes / Q000033:anatomy & histology / Q000502:physiology; D016138:Walking; D014955:Wrist Joint / Q000033:anatomy & histology*