Although pigs can be trained to pick up wooden coins and deposit them in a piggy bank in return for a food reward, they will often start "rutting" or "rooting"
By pushing the wooden token with their nose. This was a problem for

Question

Quizplus · Accepted Answer

Behaviorism focuses on observable behaviors and their responses to stimuli. The issue with pigs reverting to natural rooting behavior despite training highlights a limitation of behaviorism, which struggles to account for innate behaviors not easily modified by conditioning.

Although Pigs Can Be Trained to Pick Up Wooden Coins