The Sierra Nevada red fox (file photo) has recently been rediscovered in central California.
Photograph courtesy Keith Slausen
Published September 8, 2010
Thought as regionally extinct, the Sierra Nevada red fox has been rediscovered in the mountains of central California, thanks to a remote camera, a bag of chicken, and saliva analysis.
The discovery gives conservationists hope that the fox—listed as threatened by California—may just outfox extinction overall, scientists say.
The Sierra Nevada red fox subspecies hadn't been seen in central California since the 1990s and was considered gone from the area. Only one other population of Sierra Nevada foxes are known, farther north in the Lassen Peak region (see map).
But U.S. Forest Service officials suspected photographs taken by a trail camera near the Sierra Nevada mountains' Sonora Pass (see map) in August had captured a Sierra Nevada red fox gnawing on a "bait bag" of chicken scraps.
Researchers at the University of California, Davis, ran DNA tests on saliva samples from the bag, and sure enough, the spit confirmed the fox as a Sierra Nevada. Testing saliva is "not uncommon," said Ben Sacks, director of the Canid Diversity and Conservation Unit of the Veterinary Genetics Laboratory.
"We thought they were gone," Sacks added. "We were wrong."
(Also see "'Extinct' Booby Exposed—Found 'Masked,' Using Alias.")
Knowing there are two holdout populations of the subspecies "multiplies our reasons for optimism," Sacks added.
It "tells us not only are they not extinct, but now we're hedged," he said. "If something were to happen to one of those [populations], we have another to draw from."
Sly Fox Little Studied
Since 2006, Sacks has been studying red foxes in California—often joining the hunt for the Sierra Nevada fox. Even when he's hiking, "if I find fox-size feces at the right elevation, I pick it up and do the analysis," he said.
His genetic research, for instance, has revealed that many of the red foxes in the western U.S. are actually descendants of native Alaska and eastern U.S. foxes that were introduced in the 20th century.
But still, very little is known about the elusive Sierra Nevada subspecies—so little, in fact, that no one knows its exact population or why it's declining, Sacks said.
Sacks suspects the animals have escaped human detection in part because biologists' surveys are done at lower elevations—Sierra Nevada red foxes generally keep to the high mountains.
The new discovery "tells us we need to take them seriously," he said.
"We need some resources to study these guys and to find out how many are out there" and to "figure out how to protect them and ensure their persistence into the future."
Most Popular News
-
Best News Pictures of the Year?
See the painterly picture that won this year's World Press Photo Contest—plus a cliff-climbing polar bear, a record-breaking cave, and more.
-
Photos: Tiny Chameleons Discovered
Four new chameleon species found in Madagascar—some tiny enough to fit on a match tip—are among the smallest known reptiles.
-
Pictures: Shark Swallows Shark
Divers on Australia's Great Barrier Reef recently snapped rare pictures of a wobbegong, or carpet shark, swallowing a bamboo shark whole.
Advertisement
News Blogs
-
Snuffbox and Rayed Bean Mussels Protected
Two freshwater mussels are added to the endangered species list.
-
Humanity’s Growing Impact on the World’s Freshwater
The finiteness of Earth's freshwater is becoming ever more apparent.
-
Auroras, Meteors Shine in New Time-Lapse
Colorful auroras, meteor trains, and brilliant stars glide across the skies over the U.S. West in the new video "Temporal Distortion."
ScienceBlogs Picks
Connect With Nat Geo
Got Something to Share?
Special Ad Section
Great Energy Challenge Blog
Green Living Hot Topics
-
Organic Air Fresheners
Avoid toxic chemicals and create a calming space.
-
Surprising Recyclable Household Items
With a little know-how, you can recycle more than you think.
-
Side Effects of Vegetarianism
Find out how to stay healthy and eat lower on the food chain.
