2.5 | Statistical analysis
All analyses were executed with R 3.5.2 for Mac OSX. The package ’tidyverse’ was used for data shaping and arrangement. The factors affecting the number of seeds (or dummy seeds) carried by ants were analyzed using a generalized linear mixed model (GLMM) and likelihood ratio test. We used the zero inflated Poisson distribution with the function glmmTMB from the package ’glmmTMB’. In this analysis, colony identity was set as the random effect and the odor conditions were the explanatory variables. Chi-square tests were performed to examine whether the destination of the dummy seeds was biased.