The family that walks on all fours:

(GIF from "The family that walks on all fours" A BBC2 documentary)

“The family that walks on all fours” is a documentary made by the BBC following a Kurdish family who walk on palms of their hands and feet due to a non-progressive congenital cerebellar ataxia. 

 Due to this, members of the Ulas family are not bipedal, and instead walk with quadruped gait. 

The documentary provides interviews and explores different ideas and theories behind the causes of their walk.