Chimps have their own rich world of communication—it’s sort of like a secret sign language. Don't miss "NOVA Wonders: What Are Animals Saying?" premiering April 25 at 9/8c on PBS: http://to.pbs.org/2HbhG6Q | NOVA l PBS

Watch Chippie the chimp show off his impressive problem-solving skills! 🐒 He carefully selected the right stick for the job, demonstrating just how clever chimps can be. Tool use is a sign of advanced intelligence in animals, and Chippie is a great example – even if he didn’t realise he could simply open the other end! 😂 Peter’s eager to get in on the action too, curious to see what all the fuss is about! 🥰 . . . 📷 Chimps Team Leader Ailsa | Blair Drummond Safari Park