Predators can impact ecosystem structure and function via prey consumption, which include alteration in prey behavior or physiology in response to the risk of predation (Lima and Dill 1990; Creel and Christianson 2008; Ripple et al. 2014). Thus, studying predator-prey interactions and the factors that may affect these relationships is important, especially given population declines of many predators globally (Estes et al. 2011). Predation can also be influenced by the effects of environmental conditions on the sensory capabilities of both predators and prey (Ellis 1986; Lim and Dill 1990; Martin and Hammerschlag 2012). For example, #Predator-prey relationships can be influenced by environmental conditions, including changes in moon phase and associated lunar illumination. Two primary hypotheses have been proposed underlying the effects of #moonlight on predator-prey interactions: the predation risk hypothesis and visual acuity hypothesis (Prugh and Golden, 2014). The predation risk hypothesis predicts that increases in moonlight will enhance predation due to increases in the ability of visual predators to detect and capture prey. Whereas, the visual acuity hypothesis predicts that increases in moonlight will suppress predation due to increases in the ability of visual prey to detect and avoid predators. More recently, it has been proposed that habitat cover will modulate predation efficiency with increasing moonlight (i.e. habitat-mediated predation risk). However, few studies have tested these hypotheses during twilight hours or involved large mobile aquatic species. In a study, these hypotheses were evaluated using data collected over 16 years on predator-prey interactions between #Greatwhiteshark (Carcharodon carcharias) and #Capefurseals (Arctocephalus pusillus pusillus) at sunrise. Data from 1476 natural predation events demonstrated shark attack frequency and seal capture success was significantly higher at sunrise during periods of low (0–10 %) versus high (90–100 %) lunar illumination, which is consistent with the visual acuity hypothesis. Cont’d in comments Post by: @dannyl0mas Photo by: @juansharks