Head lengths of fire ants and crazy ants and fire ant colony size distribution.

Ants that do not share the same level letter significantly differ in head length (as indicated in a Tukey’s post hoc test). Average number is the number of fire ants in each size class in a haphazardly selected sample of 21 to 36 ants from ten nests. Percentages are from an average sample size of 28.36 ants. Errors are ±1 SE.