Monkeys have learnt to feed themselves using a robotic arm controlled by their thoughts

Dubbed "Rocky" after the cartoon character, the robo-squirrel is working its way into Hampshire's live-squirrel clique, controlled by researchers several yards away with a laptop computer and binoculars.

Sarah Partan, an assistant professor in animal behavior at Hampshire, hopes that by capturing a close-up view of squirrels in nature, Rocky will help her team decode squirrels' communication techniques, social cues and survival instincts.