Grasshopper rats, also known as the “ghost wolf,” are a unique species that emits howling sounds on a full moon night before hunting their prey. These rats, scientifically known as Onychomys torridus, inhabit the southwestern United States and northwestern Mexico and have a diet that includes scorpions, insects, other rats, and some plants. They are predators known for their ability to resist scorpion venom.
These rodents are highly aggressive and will attack anything that moves within their size range. They are even known to cannibalize when food is scarce. Grasshopper rats ambush their prey, capture them, and deliver a fatal bite to the head. They particularly enjoy preying on Arizona bark scorpions, whose venom is potent enough to cause death.
To counter the effects of venom, grasshopper rats have a unique adaptation that reduces pain signals from reaching their brain when injected with venom. They can also strategically bite off scorpion tails to prevent venom injection. The eerie howling sound they make on full moon nights helps them mark their territory and communicate with other rats.
Grasshopper rats are solitary creatures and mostly live alone, although some may form pairs. Interestingly, these pairs often end up killing their mates due to aggression or competition for territory or resources. These rodents have a bell-shaped sound path that enhances the intensity of their howls
