Dr Katja Liebal is at Twycross Zoo in Leicestershire to study the chimps in their enclosure. She believes that the chimps have their own complex system of communication and hopes to compile the world's first chimpanzee dictionary. Subscribe: http://bit.ly/BBCEarthSub Taken from Extraordinary Animals Series 2 WATCH MORE: New on Earth: https://bit.ly/2M3La96 Oceanscapes: https://bit.ly/2Hmd2kZ Wild Thailand: https://bit.ly/2kR7lmh Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this. This is a commercial channel from BBC Studios. Service & Feedback https://www.bbcstudios.com/contact/contact-us/