Scientists found that sheep preferred smiling human faces to stressed ones. The woolly creatures also preferred being around happy animals.
The research worked by giving the sheep a choice of doors through which to get food. One door showed a happy human or sheep, the other showed grumpy faces.
"They vastly preferred the smiling human or the (image of the) animal that had just had a meal," researchers said.
The discovery could help research into diseases which involve memory loss.
Earlier research by the team found that sheep could recognise 50 individual sheep faces and remember them for two years.
"We thought perhaps they could recognise emotions which are more subtle," said the researchers.
Looks like they've been proved right!