The impact of Stevia rebaudianaleaf on feeding preferences of an insect, a mite, and a mammal was investigated. The grasshopper, Valanga irregularisof the Acrididae family, avoided feeding on S. rebaudianaleaf, as evidenced by a decrease in animal weight. Increased mortality on S. rebaudianafeed was ascribed to feeding avoidance to the point of starvation. The extent of red spider mite (Tetranychus urticae) damage was not proportional to leaf steviol glycoside (SG) concentration, a result ascribed to a feeding mechanism that avoids chlorenchyma cells that contain SGs. Guinea pigs (Cavia porcellus) were presented with the choice between a control feed and feed amended to contain 5% sucrose or 0.02%, 4%, or 10% (dry weight) of S. rebaudianaleaf. Feed intake increased (39% above the control) for the diet involving high levels of SG amendment of feed (10% S. rebaudianaleaf). Encouragement of general mammalian herbivory may provide ecological fitness to S. rebaudianaif it is more tolerant of grazing pressure than other plants in its environment. Improvement in feed intake may have commercial implication for use of S. rebaudianaas an additive in stock feeds.