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Carnivorous squirrels documented in California

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Carnivorous squirrels documented in California


A California ground squirrel in Conta Costa County runs with a vole it hunted in its mouth. A study from UC Davis and University of Wisconsin-Eau Claire is the first to document widespread carnivorous feeding of voles by squirrels. Credit: Sonja Wild/UC Davis

A ground squirrel with cheeks stuffed with nuts, seeds or grains is a common sight. But a new study provides the first evidence that California ground squirrels also hunt, kill and eat voles. The study, led by the University of Wisconsin-Eau Claire and University of California, Davis, is the first to chronicle widespread carnivorous behavior among squirrels.

Published in the Journal of Ethology, the study fundamentally changes our understanding of ground squirrels. It suggests that what was considered a granivorous species actually is an opportunistic omnivore and more flexible in its diet than was assumed.

The observations occurred in 2024—the 12th year of the Long-term Behavioral Ecology of California Ground Squirrels Project conducted at Briones Regional Park in Contra Costa County. Out of 74 observed interactions with voles between June and July, 42% involved active hunting of these small rodents by ground squirrels.

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“This was shocking,” said lead author Jennifer E. Smith, an associate professor of biology at UW-Eau Claire who leads the long-term ground squirrels project with Sonja Wild of UC Davis.

“We had never seen this behavior before. Squirrels are one of the most familiar animals to people. We see them right outside our windows; we interact with them regularly. Yet here’s this never-before-encountered-in-science behavior that sheds light on the fact that there’s so much more to learn about the natural history of the world around us.”

Carnivorous squirrels documented in California
A California ground squirrel eats a vole it hunted in Briones Regional Park in Contra Costa County. Credit: Sonja Wild, UC Davis

Wild has observed hundreds of squirrels in nature and yet, even for her, when the undergraduate students came in from field work and told her what they had witnessed, she said, “No, I’m not sure what you’re referring to.” Then she watched the video.

“I could barely believe my eyes,” said Wild, a postdoctoral research fellow in the UC Davis Environmental Science and Policy department. “From then, we saw that behavior almost every day. Once we started looking, we saw it everywhere.”

Opportunists amid rapid change

Through videos, photos and direct observations at the regional park, the authors documented California ground squirrels of all ages and genders hunting, eating and competing over vole prey between June 10 and July 30.

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The squirrels’ carnivorous summer behavior peaked during the first two weeks of July, coinciding with an explosion of vole numbers at the park reported by citizen scientists on iNaturalist. This suggests the squirrels’ hunting behavior emerged alongside a temporary increase in the availability of prey, the study said. The scientists didn’t observe the squirrels hunting other mammals.

Carnivorous squirrels documented in California
A California ground squirrel dines on a vole it hunted in a Bay Area regional park. Credit: Sonja Wild, UC Davis

“The fact that California ground squirrels are behaviorally flexible and can respond to changes in food availability might help them persist in environments rapidly changing due to the presence of humans,” Wild said.

Smith added that many species, including the California ground squirrel, are “incredible opportunists.” From raccoons and coyotes to spotted hyenas and humans, the flexibility these mammals apply to their hunting strategies helps them change and adapt with the human landscape.

“Through this collaboration and the data coming in, we’re able to document this widespread behavior that we had no idea was going on,” Smith said. “Digital technology can inform the science, but there’s no replacement for going out there and witnessing the behavior because what animals are doing always surprises us.”

The researchers said many questions remain unanswered, including how widespread hunting behavior is among squirrels, whether and how it is passed down from parent to pup, and how it affects ecological processes.

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The authors are also excited to return to the field next summer to see what impact, if any, this year’s vole hunting may have on squirrel reproduction compared to the past decade.

More information:
Vole hunting: Novel predatory and carnivorous behavior by California ground squirrels, Journal of Ethology (2024). DOI: 10.1007/s10164-024-00832-6

Citation:
Carnivorous squirrels documented in California (2024, December 18)
retrieved 18 December 2024
from https://phys.org/news/2024-12-carnivorous-squirrels-documented-california.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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Tory Lanez Sues California Prison System for $100 Million Over Stabbing

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Tory Lanez Sues California Prison System for 0 Million Over Stabbing


Rapper was stabbed 16 times by fellow inmate in May 2025 while 10-year sentence in Megan Thee Stallion shooting case

Tory Lanez has filed a $100 million lawsuit against the California Department of Corrections stemming from a May 2025 incident where the rapper was stabbed in prison.

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Lanez — born Daystar Peterson and currently serving a 10-year sentence after being found guilty in the Megan Thee Stallion shooting case — also sued the warden and guards at the California Correctional Institute in Tehachapi, where the rapper was stabbed 16 times in an “unprovoked life-threatening attack” by another inmate, the lawsuit states. 

Peterson was hospitalized following the May 2025 incident, suffering a collapsed lung among stab wounds to his back, torso, and head.

According to the Associated Press, the lawsuit criticized the Department of Corrections for housing Peterson with fellow inmate and alleged attacker Santino Casio, who was serving a life sentence for second-degree murder. “The choice to house Casio with Peterson was known or should have been a known danger,” the lawsuit said, adding that Tory Lanez’ “high-profile celebrity status” made him a target.

The lawsuit also said that prison guards were slow to respond to the shanking, and didn’t employ flash grenades or other measures to halt Casio’s attack.; Casio was not charged for stabbing Peterson, the Associated Press notes.

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Lanez, who following his hospitalization was transferred to San Luis Obispo County’s California Men’s Colony, also alleges in the lawsuit that he never received his possessions from the California Correctional Institute in Tehachapi, including songbooks filled with lyrics to his unreleased music.

Lanez is serving a 10-year prison sentence for shooting Megan Thee Stallion in the foot during a confrontation in the summer of 2020. He was eventually convicted on several firearms charges, including assault with a firearm, in December 2022. In November 2025, his appeal was denied by a three-judge panel, and the 10-year sentence was upheld.



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California DOJ cracks down on hospice fraud. Takes shot at Trump Administration

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California DOJ cracks down on hospice fraud. Takes shot at Trump Administration


From one crackdown on hospice fraud to another.

A few weeks ago, the FBI arrested multiple people in Southern California that were accused of defrauding the government for millions of dollars.

In a more recent announcement last Thursday, California’s State Attorney General Rob Bonta held a press conference to announce a fraud bust of their own.

“Operation Skip Trace uncovered and ended a hospice fraud scheme that defrauded Medi-Cal of $267 million,” Bonta said. “So just to be clear, a quarter billion dollars over funds that are paid for by California taxpayers, funds that are meant to provide care to Californians in need. It is unacceptable. It is illegal and we will not stand for it.”

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The operation saw a total of 21 suspects charged as a result and dismantled a major hospice fraud scheme, with two handguns and over $750 thousand in cash seized as well.

According to the state’s attorney general, this is just one of the many cases over the years the state has cracked down on.

“This is just the latest example of the California DOJ’s longstanding ongoing and successful efforts to combat hospice and medical fraud,” Bonta said. “We have been doing this work for years. We’ve been doing it successfully before certain people in this country decided to think about it for the first time. We will continue to do this work. Heads down, sleeves rolled up, important investigative work, prosecutorial work.”

He added to that by taking a shot at the Trump Administration’s latest fraud operations.

“While healthcare fraud might be President Trump’s shiny new political talking point, the California DOJ has been going after healthcare fraud since 1979,” Bonta said. “For decades, Trump is late to the party. Protecting taxpayer dollars and protecting programs sick and vulnerable Californians rely on have been our priority for nearly five decades.”

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Governor Gavin Newsom also spoke out about this latest crackdown while taking a shot of his own at President Trump.

In a post to “X” the Governor’s Press Office wrote in part quote…

“California has been cracking down on hospice fraud long before Trump gutted oversight and pardoned the architect of the biggest health care fraud scheme in U.S. history.”

State Republicans have responded to this latest announcement from Attorney General Bonta, calling for a special session to demand accountability from the Governor on widespread fraud.



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Xavier Becerra surges in poll after Eric Swalwell drops out of California governor’s race

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Xavier Becerra surges in poll after Eric Swalwell drops out of California governor’s race


A new poll shows a major shift in the California governor’s race after former Rep. Eric Swalwell, who was once a frontrunner, dropped out of the election following several allegations of sexual misconduct.

“This definitely throws this race into even more volatility, creates a huge vacuum,” Pomona College politics professor Sara Sadhwani said. 

According to the new numbers, Xavier Becerra, the former state attorney general and Health and Human Services Secretary under President Biden, is surging in popularity. 

In Emerson College’s Inside California Politics poll, Becerra is now polling at 10%, a seven-point jump since March.

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Republican Steve Hilton remains in the lead with 17%, followed by Riverside County Sheriff Chad Bianco at 14%.

Among Democrats, billionaire Tom Steyer leads the pack with 14%, followed by Becerra and former Rep. Katie Porter at 10% each. San Jose Mayor Matt Mahan sits at 5%.

The poll showed that 23% of voters remain undecided.

“Xavier Becerra should be the happiest of them all because he’s the biggest move in this survey,” said Zev Yaroslavsky, director at UCLA’s Luskin School of Public Affairs.

Emerson College conducted the poll right after Swalwell dropped out of the race and President Trump endorsed Hilton.

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“I believe over time, because Trump has endorsed Hilton for the governorship, that Hilton will continue to edge up and Bianco by definition will have to go down,” Yaroslavsky said. 

Last weekend, the California GOP held its convention, and, similar to the Democrats, the party did not make an endorsement. However, Bianco received the most votes from the GOP delegates.

“We’re extremely happy with how it came out,” Bianco said. “There was a lot of effort put in by my opponent. Hundreds of thousands of dollars to try and win this election.

With the large number of undecided voters, Yaroslavky believes that the race is still in the air. 

“It’s still early,” Yaroslavsky said. “It’s a little less than seven weeks before the election. The ballots go out at the beginning of next month. People, at least 30%, still haven’t made up their mind.”

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In the state’s primary system, only the top two vote-getters in the June primary will advance to the November general election.   



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