Navigation Links
Beware of predatory male black bears
Date:5/10/2011

Fatal encounters with black bears have been exceedingly rare during the last century, but appear to be mainly the result of predatory male bears targeting humans in their wilderness home ranges, according to a new study led by the world's leading expert on bear attacks.

In an article published today in the Journal of Wildlife Management, University of Calgary professor emeritus Dr. Stephen Herrero, University of Calgary graduate Andrew Higgins, and colleagues from the Massachusetts Division of Fisheries and Wildlife and Brigham Young University analyzed the circumstances of all recorded deaths inflicted by non-captive black bears in North America between 1900 and 2009. The study found that 63 people were killed in 59 incidents in Canada, Alaska and the lower 48 states. The researchers determined that the majority (88%) of fatal attacks involved a bear exhibiting predatory behaviour, and 92% of the predatory bears were males. The authors suggest male black bears have evolved some different behaviours than females.

"Each year there are millions of interactions between people and black bears with no injuries to people. So while the risk is low, it does exist," said Herrero, an expert in bear behaviour and ecology in the U of C's Faculty of Environmental Design. "Our findings raise some important new insights that can be used to better understand the cause of attacks and how they can be avoided in both the front and backcountry."

In particular, the common belief that surprising a mother bear with cubs is the most dangerous kind of black bear encounter is inaccurate. Instead, lone male black bears hunting people as a potential source of food are a greater cause of deadly maulings and related predatory attempts. The study also found that fatal attacks do not typically involve bears that are familiar with humans, although some fatal attacks did.

"Most fatal black bear attacks were predatory and all fatal attacks were carried out by a single bear," Herrero said. "With training, people can learn to recognize the behaviour of a bear that is considering them as prey and deter an attack by taking aggressive action such as fighting back."

The paper confirms other current perceptions and bear management practices. It found that bears that have previously killed people are more likely to attack again; parties of more than two people are much less likely to be attacked; and human food and garbage tends to attract bears and may increase the likelihood of serious bear attacks.

Examining 110 years of data also allowed the researchers to identify historical and geographic trends of black bear attacks. They found that 86% of fatal attacks occurred since 1960; that fatalities are more common in Canada and Alaska despite lower human populations and less contact between humans and bears than in the lower 48 states; and that human population growth is accompanied by rising fatal bear attacks.

"We didn't demonstrate why population growth is correlated with more bear attacks but we suspect it is because there are more people pursuing recreational and commercial activities in black bear habitat," Herrero said. "Similarly, we don't know exactly why there have been more attacks in Canada and Alaska, but we speculate that it could be because bears in those areas are living in less productive habitat with periodic food stress, which may predispose some bears to consider people as prey."


'/>"/>

Contact: Grady Semmens
gsemmens@ucalgary.ca
403-220-7722
University of Calgary
Source:Eurekalert

Related biology news :

1. NASA scientist publishes new book: Coming Climate Crisis? Consider the Past, Beware the Big Fix
2. Urban gardeners beware: There may be lead in your soil and food
3. Buyer beware: Dangerous levels of lead found in used consumer products
4. Coffee, energy drinkers beware: Many mega-sized drinks loaded with sugar, MU nutrition expert says
5. Predatory bacterial swarm uses rippling motion to reach prey
6. Mighty predatory mite and oil sprays may save eggplant production in Micronesia
7. Predatory bugs can save cornfields
8. Study: urban black bears live fast, die young
9. Chemopreventive agents in black raspberries identified
10. Biologists solve mystery of black wolves
11. New blackberry introduced
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/20/2016)... -- VoiceIt is excited to announce its new marketing ... working together, VoiceIt and VoicePass will offer an ... slightly different approaches to voice biometrics, collaboration between ... Both companies ... "This marketing and technology partnership allows VoiceIt ...
(Date:5/12/2016)... 2016 WearablesResearch.com , a brand of ... results from the Q1 wave of its quarterly wearables ... consumers, receptivity to a program where they would receive ... insurance company. "We were surprised to see ... Michael LaColla , CEO of Troubadour Research, "primarily because ...
(Date:5/3/2016)... 2016  Neurotechnology, a provider of high-precision biometric ... Biometric Identification System (ABIS) , a complete system ... ABIS can process multiple complex biometric transactions with ... fingerprint, face or iris biometrics. It leverages the ... MegaMatcher Accelerator , which have been used ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... June 23, 2016 /PRNewswire/ - FACIT has announced ... biotechnology company, Propellon Therapeutics Inc. ("Propellon" ... commercialization of a portfolio of first-in-class WDR5 inhibitors ... such as WDR5 represent an exciting class of ... precision medicine for cancer patients. Substantial advances have ...
(Date:6/23/2016)... 23, 2016  The Biodesign Challenge (BDC), a university ... to harness living systems and biotechnology, announced its winning ... New York City . ... showcased projects at MoMA,s Celeste Bartos Theater during the ... MoMA,s senior curator of architecture and design, and ...
(Date:6/23/2016)... Ky. , June 23, 2016 ... two Phase 1 clinical trials of its complement ... placebo-controlled, single and multiple ascending dose studies designed ... pharmacodynamics (PD) of subcutaneous injection in healthy adult ... subcutaneously (SC) either as a single dose (ranging ...
(Date:6/23/2016)... ... 23, 2016 , ... Regulatory Compliance Associates® Inc. (RCA), a ... webinar on Performing Quality Investigations: Getting to Root Cause. This ... charge. , Incomplete investigations are still a major concern to the Regulatory Authorities ...
Breaking Biology Technology: