Herbivores like cows and sparrows have eyes on the side of their heads. This enables them to see predators from nearly 360 degrees. Herbivores live in constant fear of violent death. Carnivores, such as wolves and big cats, regularly detect key information from scents laid down by other carnivores. Even predators must continually stay on top of threats. An ecological “landscape of fear” has been postulated where animals withdraw in the presence of predators. The fear of death is not due to a lack of courage; rather, it is natural, sensible, and evolutionarily adaptive.