See SI for all the predictive equations and model development. We compared model-averaged predictions to our individual raw THg concentrations and found good agreement for both the more complex models (grebe blood: R2 = 0.61; grebe eggs: R2 = 0.47; sport fish: R2 = 0.83; Figure S3) as well as the simplified models that only included THg concentrations in prey fish (grebe blood: R2 = 0.52; grebe eggs: R2 = 0.43; but not as good for sport fish: R2 = 0.29).