They categorised facial dimensions such as the distance between the eyes, then recorded the electrical activity of one brain cell at a time while they showed cartoons to the macaques.

ECONOMIST: Facial characteristics

Among the rental items: a two-meter-long snake, an orangutan and some lizards and tarantulas. (The island is home to such creatures as pythons, macaques and fruit bats.) While the castaways need to be mentally and physically fit, wilderness experience isn't a must.

CNN: Have Footage, Will Travel