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Figure S1. Male giraffes displaying a classic alert posture after detecting lions nearby. This vigilance behavior is usually accompanied by the suspension of foraging or other activities. Giraffes will turn to gaze at nearby lions, and some individuals may advance toward predators for a closer look (Dagg & Foster, 1982). This behavior is observed in solitary individuals as well as members of single-sexed and mix-sexed herds. However, not all individuals in a herd will assume an alert posture, and some may seem indifferent to lions (Mejia, in Moss, 1982; Strauss, unpubl. data). Photograph taken in Serengeti National Park by P. Jigsved.

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