Scientists tested five ravens. They had the birds do a new task. The first task was to use tools. The scientists showed the birds a box. The box had a tube sticking out. The birds were taught that they could use a stone as a tool. If they dropped a stone into the tube, a treat would come out of the box. Later, the scientists brought back a stone and other objects. The birds had already been taught that these other objects would not help them get the treat. Then the scientists brought back the box and the tube. Most of the birds placed the stone in the tube. Do It! The birds __________. Press enter to interact with the item, and press tab button or down arrow until reaching the Submit button once the item is selected A escaped B recovered C climbed D remembered
