An example of primates who show a high level of complexity in linguistics are the East African Vervet monkeys. East African Vervet monkeys have been found to use complex vocal sounds for warning others in their group of predators (Zuberbuhler 2005:2). They can only think about feeding themselves and to run from predators to survive and they use various vocal acoustics and physiological movements in order to communicate danger (Zuberbuhler 2005:3). Scientists believe these studies may lead us towards an answer for the origin of human language, a complex phenomenon still unknown (Zuberbuhler 2005:1). Scientists have also observed various intellectual behaviors in nonhuman primates. Chimpanzees, for example, can successfully open a milk bottle
