Fear of the human super predator reduces feeding time in large carnivores

Smith and colleagues, working with the Santa Cruz Puma Project, used playback experiments at puma kill sites, broadcasting human voices versus a control of frog calls, while monitoring the cats' behavior with GPS and accelerometer collars. Pumas overwhelmingly fled from the sound of humans, abandoned or delayed return to their kills, and reduced their feeding time, forcing them to compensate by killing more prey. The study provided direct experimental evidence that fear of humans, perceived as a super predator, imposes real energetic and ecological costs on a large carnivore, independent of actual hunting or persecution. It showed that the mere presence of human cues reshapes predator behavior and predation rates. The work is a landmark in the ecology of fear, demonstrating that humans alter carnivore movement and feeding through perceived risk alone.