Interspecific interactions between three sympatric species of kangaroo rats (Dipodomys)

Interspecific interactions between Dipodomys merriami, D. ordii, and D. panamintinus were observed in the laboratory. The largest species, D. panamintinus, was the most dominant while the smallest species, D. merriami, was the least dominant. All interactions were characterized by extreme fighting. Laboratory and field evidence indicate that interspecific aggression in the field may be one mechanism keeping these sympatric species of kangaroo rats ecologically separate.