Models generated to explain the variation in the number of correct answers according to species.

Each model shows the determinant coefficient (R2), the Akaike’s Information Criterion (AIC) score, the difference in the AIC score from that of the best model (ΔAIC), and the AIC weights (AIC Wi). The variables used were body size (BS), popularity (Pop), length of time of inclusion on the Red List (Time), and endangered status (End). See details in the Materials and Methods.