 Some differences also arise in how models are tested in HBE verses non-human animal behavioral ecology. The description of that strategy picked out by the model will usually include descriptions of potential behavioral responses to conditions (or values for parameters of those responses) that go beyond what has already been observed; this means the model predicts that these responses should also occur if the description of the strategy is correct. For example, in Kaplan and Hill’s prey choice case, the model predicts patterns of Ache prey choice that the observers had not yet seen, such as which prey the Ache should and should not take on encounter and under what circumstances. The model, therefore, can be tested by looking for a situation in which the response conditions of the strategy obtain and observing whether the behavior in response to those conditions is as the model suggests. This is partly why such rules are tested in foraging societies—because many of these strategies have response conditions which reflect conditions presumed to be present in the human evolutionary past, and which may obtain in foraging societies but not in industrial of agricultural societies. For example, obviously in Kaplan and Hill’s foraging case, few if any industrial or agricultural societies routinely engage in foraging that is a primary source of nutrition, and hence don’t present an opportunity for individuals to do prey choice of the right type. The other reason for performing these tests in foraging societies is because the HBEs want to understand the local causes of overt behavior in these societies in particular.