All the sheep passed the test, scoring an average of 80%, showing that they learn to recognize unfamiliar faces, even in 2-D. But are sheep memorizing the images, or do they recognize individuals?

所有的绵羊都通过了测试，平均得分为 80%，这表明它们学会了识别不熟悉的面孔，即使是二维的。但是绵羊是在记住图像，还是在识别个人？