Sheep have been notoriously associated with the "herd mentality" insult. In fact, the Miriam-Webster dictionary, included into its list of recognized words this April, the word "sheeple," -- which is a derogatory term directed at "people who are docile, compliant, or easily influenced," or just plain simple-minded. But a major study published in the journal Royal Society Open Science, has now debunked the stupidity that we have come to associate with sheep. Researchers from the University of Cambridge have trained sheep to identify the pictures of celebrities including Emma Watson, Jake Gyllenhaal, journalist Fiona Bruce and Barack Obama. The team was astonished to find that the animals are able to recognize familiar faces from just 2-D images.