When reading the chapter comparative cognition I found it interesting when they were talking about the Vervet money and the alarm calls. I found a video on YouTube about the different calls that they have. If they see a hawk they run for the middle of the tree, a snake they stand on their back legs, and scan the area and if they see a leopard they get in the trees. In the video it explains they have different calls for different predators, for instance, when they see a leopard it is a much higher pitch sound then for the snake or hawk, and the snake is a higher pitch then the hawk. I found it interesting that they can distinguish between the sounds and know what to do when facing danger. This shows that animals do communicate and have their own language.