Study: Orangutans Play Leaf Instruments to Fool Predators

Using the first known animal instruments, orangutans use leaves to make their voices sound deeper, perhaps thereby tricking predators into thinking the apes are bigger than they really are, according to a study published in the journal Proceedings of the Royal Society B. Orangutans produce a noise known as "kiss squeaks" to let predators like snakes and leopards know that they've been spotted, and can use their lips and fingers or folded leaves to make the sound. To find out more about why the animals produce the noise,