Hooves and feet

Engravings of human footprints and animals may depict the moment of transformation from human to spirit animal.

Symbols in Namibian rock art https://t.co/PFsiAF0cKk #Africa #RockArt #archaeology pic.twitter.com/SiCFvnHXcw

— Bradshaw Foundation (@BradshawFND) June 1, 2017

Sometimes the hoof prints of animals are shown with human footprints. 

Birds

Birds are prominent among the Twyfelfontein engravings, but do not include short-legged species that perch or hop. All the birds shown are species that stride, such as ostriches. The birds are often shown in a line, walking or dancing like people in the typical 'arms back' posture of ritual dance. Such images may represent people transformed into birds.