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Description: The evaluability bias has been found to influence decision-making in the context of charitable giving that saves human lives (Study 1). Donors tend to overweight the importance of an attribute in proportion to its ease of evaluation. In other words, donors find it easier to evaluate overhead ratios over cost-effectiveness when evaluated in isolation. A second study seeks to answer the question of whether the evaluability bias holds in the context of charitable giving which saves animal lives (Study 2). Then, a differential effect is calculated to quantitatively understand the evaluability bias in saving human lives against saving animal lives. I attempt to understand the significance of this differential effect by hypothesising that humans who rank highly on a speciesist scale donate less to animal charities.​