Awakening early from a mid-day nap and surrounding by adult females in its family, an African elephant calf begins playing with its previously sleeping cousin. Using a graph theoretic approach, analysis reveals that elephants adjust their sleep patterns and locations relative to human activity. In human dominated landscapes elephants sleep more during the day in locations far from water, while they do the opposite in protected areas. Photo taken by Shifra Goldenberg in Samburu National Reserve, Kenya.
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