Estimates of Boreal Toad embryo survival probability (Ŝ^E) and SEs (in parentheses) for egg mass halves that were caged or exposed to predation. There were 10 egg masses found at the control and Cutthroat Trout sites in Rocky Mountain National Park in 2013 and 2014. The proportional difference, defined as the difference in survival probability between the caged and exposed halves divided by the caged survival probability, and associated variance are also given.