Scientists gave raccoons a nine-way puzzle with one marshmallow; they kept solving it even after the food was gone
Raccoons have long been credited with outwitting latches, and a study has tested that reputation. University of British Columbia researchers Hannah Griebling and Dr Sarah Benson-Amram gave captive raccoons a custom puzzle box with nine entry points, grouped as easy, medium and hard. Each 20-minute trial held a single marshmallow; the raccoons often kept opening … Read more
