Happy as a Pig in Muck? (IMAGE) University of Göttingen Caption The pig’s surroundings clearly have a greater influence on people's perception than on the expression of the animal itself. Credit Landpixel (Swen Pförtner) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.