A study out of UC Davis and the University of Wisconsin–Eau Claire has revealed that California ground squirrels aren’t just scavengers and seed hoarders. They’re hunting live prey too. In summer 2024, during a long-term behavioral ecology project at Briones Regional Park, researchers documented California ground squirrels chasing, killing, and consuming voles.
Traditionally, California ground squirrels (Sciurus beecheyi) have been classified as granivorous or herbivorous – feeding mainly on seeds, nuts, fruits, and the occasional insect or egg. But this new observation marks the first documented case of widespread carnivory.
Squirrels were seen hunting adult voles, stalking them, delivering lethal neck bites or shaking motions to dispatch them and then consuming the carcass.
Researchers report that this hunting behavior occurred across ages and both sexes of squirrels, peaking during early July when vole populations surged, suggesting opportunistic foraging tied to prey availability.
The discovery provides a fresh insight into wild animals’ adaptability. This predatory shift may help squirrels survive periods when their usual plant-based foods become scarce or when novel opportunities arise.
Research is needed or perhaps is underway to answer important questions like – Is this event isolated to this squirrel population or region? Does it affect vole populations and broader predator-prey dynamics locally?
The future may have all the answers about this and more shifting dietary preferences of wildlife.
Sources:
UC Davis: “Carnivorous Squirrels Documented in California” studyfinds.org+5UC Davis+5UC Davis+5
Journal of Ethology: “Vole hunting: novel predatory and carnivorous behavior by California ground squirrels” instagram.com+13SpringerLink+13The Independent+13
The Guardian: “’It’s a dietary niche’: researchers amazed to find squirrels hunt and eat voles” People.com+12The Guardian+12snopes.com+12
San Francisco Chronicle: “California ground squirrels stun researchers…” San Francisco Chronicle+2instagram.com+2
