Pigs trained to pick up large wooden coins subsequently delayed receiving a food reinforcer because they would repeatedly drop and push the coins with their snout.This best illustrates:

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Instinctive drift refers to the tendency of animals to return to their innate behaviors following repeated reinforcement. In this case, despite being trained to pick up wooden coins, the pigs eventually reverted to their natural instinct of using their snout to manipulate objects. This interfered with their ability to receive a food reinforcer, suggesting that their innate behavior was stronger than their learned behavior.

Pigs Trained to Pick Up Large Wooden Coins Subsequently Delayed