Visitors to a Devon zoo in the next two weeks have an extra exhibit to look at, a group of 10 human volunteers.
The group has been at the zoo since Monday
The group has been living, eating and sleeping in special quarters at Paignton Zoo since Monday.
The men and women are taking part in a two-week experiment for a new BBC series, The Truth About Food.
They are living in a tented enclosure in the zoo, eating a diet similar to the zoo's gorillas and orang-utans and undertaking a number of tasks.
The volunteers will be eating a hunter-gatherer type diet similar to that of cavemen as part of the experiment to see if it can improve health.
The results will be revealed in the series, which is to be shown next year.
Paignton Zoo spokesperson Phil Knowling said: "We are very happy to be hosting this experiment.
"It should be a fascinating experience all round."