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Fig. 2. The relationship between mass-specific rate of oxygen consumption (sO2) and heart rate (fH) for seven marine iguanas from Santa Cruz Island, Galapagos, at 27 °C (open circles) and 36 °C (filled circles). The group regression equations are: sO2=0.013fH-0.361, r2=0.86, and sO2=0.011fH-0.561, r2=0.91, respectively.