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Lions have long been perceived as Africa's, if not the world's, most fearsome terrestrial predator, 1,2,3,4,5,6,7,8,9 the "king of beasts". Wildlife's fear of humans may, however, be far more powerful and all-prevailing 1,10 as recent global surveys show that humans kill prey at much higher rates than other predators, 10,11,12 due partly to technologies such as hunting with dogs or guns. 11,13,14,15 We comprehensively experimentally tested whether wildlife's fear of humans exceeds even that of lions, by quantifying fear responses 1 in the majority of carnivore and ungulate species (n = 19) inhabiting South Africa's Greater Kruger National Park (GKNP), 9,15,16,17 using automated camera-speaker systems 9,18 at waterholes during the dry season that broadcast playbacks of humans, lions, hunting sounds (dogs, gunshots) or non-predator controls (birds). 9,19,20,21,22 Fear of humans significantly exceeded that of lions throughout the savanna mammal community. As a whole (n = 4,238 independent trials), wildlife were twice as likely to run (p < 0.001) and abandoned waterholes in 40% faster time (p < 0.001) in response to humans than to lions (or hunting sounds). Fully 95% of species ran more from humans than lions (significantly in giraffes, leopards, hyenas, zebras, kudu, warthog, and impala) or abandoned waterholes faster (significantly in rhinoceroses and elephants). Our results greatly strengthen the growing experimental evidence that wildlife worldwide fear the human "super predator" far more than other predators, 1,19,20,21,22,23,24,25,26,27,28 and the very substantial fear of humans demonstrated can be expected to cause considerable ecological impacts, 1,6,22,23,24,29,30,31,32,33,34,35 presenting challenges for tourism-dependent conservation, 1,36,37 particularly in Africa, 38,39 while providing new opportunities to protect some species. 1,22,40 • Lions have been viewed as the world's most fearsome predator, the "king of beasts" • New global surveys show humans kill prey at much higher rates than other predators • Fear of humans vs. lions was tested in iconic savanna mammals from elephants on down • Fear of the human "super predator" far prevails over that of the "king of beasts" Zanette et al. experimentally show that fear of humans far exceeds that of lions throughout the mammal community in a premier African protected area; strengthening the evidence that fear of the human "super predator" pervades the planet. Paramount fear of humans adds to our global environmental impacts as fear itself can reduce wildlife numbers. [ABSTRACT FROM AUTHOR]