This document discusses a study that compared bill length in two species of hummingbirds: Archilochus colubris and Cynanthus latirostris. Researchers took measurements of 10 individuals of each species and calculated the mean and standard deviation. The mean bill length was 15.9mm for A. colubris and 18.8mm for C. latirostris. A. colubris had greater variability in its data (standard deviation of 1.91) compared to C. latirostris (1.03). A t-test showed a statistically significant difference between the means, allowing the researchers to reject the null hypothesis that there is no difference in bill length between the species.