在此项研究中，训练20只美利奴母羊幼崽，使其可以辨别两只水桶，一只水桶代表食物，另一只则呈小狗的模样—对母羊幼崽来说，极度不想看见这种画面。
In this study, 20 young merino ewes were trained to distinguish between two buckets, one of which led to food and another to the appearance of a dog - a highly unpleasant sight for a young ewe.
2013年，大熊猫“美香”在华盛顿国家动物园生下了“宝宝”。她是2005年以来该动物园首只存活的熊猫幼崽。
A giant panda named Mei Xiang gave birth to Bao Bao at Washington's National Zoo in 2013. She was the zoo's first surviving panda cub since 2005.
2013年，大熊猫“美香”在华盛顿国家动物园生下了“宝宝”。她是2005年以来该动物园首只存活的熊猫幼崽。
A giant panda named Mei Xiang gave birth to Bao Bao at Washington's National Zoo in 2013. She was the zoo's first surviving panda cub since 2005.
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