Tourists who flock to see an endangered species of monkey in its natural environment could be putting the creatures at risk.
This is according to a team of British-based researchers who have been studying interactions between humans and Barbary macaques in Morocco.
Channel 4 News reported there are believed to be fewer than 6,000 of the primates left in the wild and they have become a popular attraction, but the scientists have warned the presence of humans is distressing them and causing anxiety.
Researcher Dr Stuart Semple called for a set of guidelines to be introduced that will allow people to continue viewing the monkeys without disturbing them, such as keeping their distance and not feeding the creatures.
However, he was not in favour of banning 'primate tourism' altogether, as he said it brings much needed attention to the animals and provides economic benefits that help with their conservation.