PARIS – Sheep learned to recognize Barack Obama after seeing his photo a few dozen times, says a study that suggested our four-legged friends may be smarter than we think. The former U.S. president was one of four celebrities used in a test of the woolly creatures' face-recognition skills, along with Harry Potter actress Emma Watson, British TV host Fiona Bruce and American actor Jake Gyllenhaal, the research team said. "We chose these people because there were lots of images of each person available online, both front-on and taken at different angles," said study co-author Jennifer Morton of the University of Cambridge. "We also chose them because we were sure that our sheep had never met them in person." Morton and a team trained eight sheep to recognize the faces from a frontal photo of each of them.