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Calculated linear growth rates for (A) two tusks of female African elephants, (B) upper (U) and lower (L) hippo canines collected from an individual in Queen Elizabeth National Park, Uganda in 1971, and (C) lower canines from two hippos from Tsavo National Park, Kenya whose lives overlapped by ca. 1 y (shaded area). Growth rates (±2σ) are calculated from the slope of the regression lines. Calibrated 14C age uncertainty is 2σ and if not shown is smaller than the symbol.
