Evolutionary changes in the predatory attack of carnivorous rodents: A comparative analysis emphasizing grasshopper mice (Onychomys spp.).

Abstract

The predatory attack itself may differ between that of a carnivorous and omnivorous species, given the shift in lifestyles. I reviewed the information on 63 carnivorous rodent species. The approach here is to compare the predatory attack of carnivorous grasshopper mice (Onychomys torridus and Onychomys leucogaster) with that of the deer mouse (Peromyscus maniculatus) to identify specific differences. The predatory attack of a carnivorous rodent differs from that of the omnivorous rodent in its ability to overcome the flight initiation distance of potential prey, biting capabilities, use of its sensory modalities, seizure of prey, early and rapid development of a proficiency in its attack, vigor of its attack, and resistance to inhibition of the attack. The grasshopper mouse intimidates other rodents with which it competes for prey by a combination of its highly aggressive attack and advertisement of its presence. Focusing on the importance of overcoming the flight initiation distance of potential prey, the distinct and separate nature of the predatory attack, and behavior that reduces competition for prey can provide a framework for describing the evolution of a carnivorous lifestyle in other mammals. (PsycInfo Database Record (c) 2021 APA, all rights reserved).