Bear Naked Truth

A female black bear takes in her surroundings from the safety of a pine tree after being trapped, tagged and hazed by state parks and wildlife staff last fall. CDFW photo by Travis VanZant.

As the Lake Tahoe Basin’s black bears emerge from their winter slow-down and slumber, campground managers, biologists, park rangers and wildlife officers hope to have a new tool at their disposal to help manage the human-bear conflicts certain to arise this spring and summer: a growing catalogue of Tahoe’s bear population.

Since the fall of 2019, the California Department of Fish and Wildlife (CDFW) and California State Parks have teamed up to trap, tag and haze as many Tahoe bears as possible to identify individual bears, build a genetic database of the population, study its overall health, and whether related bears are passing down problem behaviors from one generation to the next. Eighteen bears have been trapped to date – four of those being recaptures. Genetic material is collected and each bear is outfitted with an identifying ear tag before release.

This May, CDFW will broaden the effort and team up with the U.S. Forest Service to trap, tag and haze additional bears within the Tahoe National Forest. The trapping takes place in short windows during the early spring and late fall off-seasons at Tahoe-area campgrounds. The bears are hazed – but not harmed – upon release to provide a negative human interaction and to see whether the experience will keep them away from campgrounds and people in the future.

In the following video, Shelly Blair, CDFW’s wildlife biologist for El Dorado and Alpine counties, and Sarinah Simons, California State Parks Sierra District human-bear management specialist, explain the innovative collaboration and scientific work during trapping efforts last fall.

The California Department of Fish and Wildlife (CDFW) and California State Parks are teaming up on a black bear research project in the Lake Tahoe Basin starting this fall. The goal is to gather genetic information on individual bears so that wildlife managers can identify individuals, better understand relatedness among bears, further understand their behavior and movements, and acquire a greater sense of the relative density of this species throughout the Tahoe Basin. Three black bears already have been captured, tagged and released this week as part of this scientific initiative.

Sarinah Simons from California State Parks collects a saliva sample from a Tahoe Basin black bear last spring. CDFW and State Parks are collaborating this fall to build a DNA database and inventory of Lake Tahoe's black bear population. CDFW photo.

The biologists will capture, immobilize and ear-tag individual bears while collecting biological samples (DNA through blood, hair, and saliva swabs). Trapped bears will receive a full field evaluation and the animal’s vital signs—heart rate, temperature, and respiration—will be monitored throughout the entire process. An inventory and DNA database of the Tahoe Basin's bear population will be accumulated over time.

Aversive hazing (“tough love”) may be applied to bears upon release. Techniques will include bean bag and paint ball projectiles as well as air horns. These tactics are based on a simple principle: If bears are smart enough to learn from positive experiences, perhaps they are smart enough to learn from negative ones as well.

Through this collaborative partnership, CDFW and State Parks aim to reduce the number and frequency of human-bear conflicts and restore black bears in Lake Tahoe to their natural and wild behavior. However, this can only be done through positive cooperation from the public. This includes storing all food and garbage in secure, bear-proof facilities, discouraging bears from residing in developed areas and NEVER feeding bears or other wildlife. Together, we can all work to keep Tahoe bears safe and wild.

CDFW and State Parks will attempt to capture, tag and release as many black bears as possible in the Tahoe Basin this fall in order to build up a DNA database of the population, be able to identify individual bears responsible for conflicts and provide aversive hazing to minimize future human-bear conflicts. CDFW photo.

A sedated, immobilized Carnelian Bay black bear awaits a wildlife veterinarian's examination inside CDFW's Wildlife Investigations Lab near Sacramento. CDFW photo.

As wildlife managers, California Department of Fish and Wildlife (CDFW) staff are trained to hope for the best while preparing for the worst.

Last weekend, a CDFW environmental scientist specializing in human-wildlife conflicts responded to worried reports about a very sick or injured bear in the Carnelian Bay area of northern Lake Tahoe in Placer County. These reports were bolstered by a troubling video clip that showed a staggering bear slowly entering a small patch of habitat in a residential area. When CDFW arrived at the scene, the listless animal was located under a nearby structure.

Finding a bear that was mostly non-responsive, CDFW acted swiftly under animal welfare protocols to anesthetize the bruin and transport it to its Wildlife Investigations Lab near Sacramento for further expert evaluation. A veterinarian’s exam confirmed a severely dehydrated and emaciated adult female black bear with sunken eyes, protruding bones, and only weighing 115 pounds – or about half the average size for a female bear more than 10 years of age.

The bear’s significantly compromised condition, coupled with abnormal swelling of her mammary glands and other lesions, led CDFW to a presumptive diagnosis of “end-stage metastatic cancer.” As such, this animal’s suffering was ended as swiftly and humanely as possible, and the initial diagnosis was later confirmed via necropsy.

The California Department of Fish and Wildlife (CDFW) recently ended a multi-trap effort to remove a public safety bear from Lake Tahoe’s North Shore after the trapping effort proved unsuccessful and there were no more signs of the offending bear in the community.

The trapping effort was initiated last month by CDFW law enforcement following a bear attack of a victim inside his North Shore home. On August 27, a bear entered an occupied residence and severely bit a male victim, who was trying to encourage the bear to leave the house. It was an unprovoked attack. The bear had an exit, began to move toward the exit, and then turned back away from the exit into the house to bite the victim.

Between September 5 and 13, forensic evidence (DNA matches from samples collected at the house) proved the attack was caused by the same bear responsible for four other break-ins into occupied homes – and into one house twice the same night.

As with all public safety incidents, the decision to trap and remove the bear was made by CDFW law enforcement. CDFW law enforcement is required to investigate and make a decision regarding trapping a public safety animal based on interviews, physical evidence and the totality of the circumstances surrounding an incident. Public safety is among CDFW’s chief responsibilities with regard to black bears in Lake Tahoe. This was not a depredation event.

CDFW obtained approval from all property owners where bear traps were set. Property owners were fully supportive and cooperative with the trapping effort. Two bears that entered the traps during the effort were tagged and safely released after DNA analysis proved they were not the offending, public safety bear.

The trapping effort was active for two weeks. After CDFW determined that acquiring the target bear was unlikely, the traps were removed. CDFW communicated this to interested Tahoe residents on September 23. CDFW continues to monitor the North Shore community for bear activity and is poised to collect and analyze any forensic evidence from any further break-ins. CDFW will reinstall traps if necessary to protect the safety of the Lake Tahoe community.