Figure 16.6 Seed size competition in rodents and ants. The two groups of herbivores in the deserts of Arizona consume seeds of similar size, although rodents prefer somewhat larger seeds and ants prefer somewhat smaller seeds. This overlap in seed consumption means that these two distantly related species can compete with each other.
Data from J. H. Brown and D. W. Davidson, Competition between seed-eating rodents and ants in desert ecosystems, Science 196 (1977): 880–882.