grulloEtymologyBorrowed from Spanish grullo, from grulla (“crane (bird)”).nounA colouring of horses characterized by smoky or mouse-colored hairs on the body, often with shoulder and dorsal stripes and black barring on the lower legs.A horse having this colouring.“At first light they followed the dim tracks of her father's grullo, nearly obliterated by the rain but, when she put herself in the right mind, clear enough to follow.”