Boxplots depicting the medians (bold lines), interquartile ranges (IQRs; 25th–75th percentiles; rectangles), minimums (first quartile-1.5*IQR) and maximums (third quartile+1.5*IQR; dashed lines), and any outliers (black dots) for A mass, B head-body length, and C body condition index for live-trapped rats (Rattus spp.) in forest habitats on Guam (n = 19 rats) and Rota (n = 163 rats) in the Mariana Islands during June 2018–August 2019. Statistics shown in the bottom-left corners are for Wilcoxon rank-sum tests (α = 0.05). Rats were A heavier and had C higher body condition indices on Guam compared to Rota, but there was no difference in B head-body lengths between the two islands.