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Elsewhere in the barn, behavioral biologist Sandra Düpjan has been replicating the famous “marshmallow test” with pigs.

The classic marshmallow test, invented by the late psychologist Walter Mischel, involves presenting a child with one marshmallow and explaining that they can have it now or they can have two later if they wait until the marshmallow giver returns.

Some studies have found that better performance on that marshmallow test in childhood predicts better outcomes in school, relationships and health later in life.

In 2021, Alexandra Schnell, a biologist at the University of Cambridge, and others found that cuttlefish can pass a version of the marshmallow test, a famous measure of self-control in human psychology.

In recent years, a string of high-profile papers has reported that they are capable of surprising cognitive feats, including rejecting easy meals while holding out for better food in the future, a version of the famous marshmallow test.