Ein Ochse, der sich mit dem Kopfe an einem Pfahl reibt 

"Ein Ochse, der sich mit dem Kopfe an einem Pfahl reibt" ("An Ox Rubbing Its Head Against a Post"), is a charcoal drawing by Dutch artist Karel Dujardin. The drawing depicts a single ox rubbing its head against a wooden post in a natural landscape. Dujardin was a master of animal studies, evident in the detailed depiction of the ox's anatomy and expression, capturing the animal's movement and texture. The work is characteristic of Dujardin's style, known for its meticulous detail and naturalistic approach. The simple composition and the focus on the animal's interaction with the post create a sense of tranquility and observation. "Ein Ochse, der sich mit dem Kopfe an einem Pfahl reibt" is a prime example of Dujardin's mastery of animal portraiture and his contribution to the Dutch Golden Age art movement.