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Open Access Publications from the University of California


The Hopland Research and Extension Center (HREC) is the University of California's principal field research facility for agriculture and natural resources in the North Coast region. In 1951, the University purchased the 4,630-acre Roy L. Pratt Ranch at Hopland, California to use as a site for long-term, controlled research on native rangelands, watersheds, and wildlife. The Center now extends over more than 5,300 acres. A diversity of soils, plant and animal communities, and elevations makes HREC representative of many parts of the Coast Range in northwestern California. The Center also maintains a research flock of 600 to 1,000 breeding ewes, which graze the majority of the Center's rangelands.

Hopland Research and Extension Center

There are 3 publications in this collection, published between 1998 and 2004.
Recent Work (3)

Annotated Bibliography 1951-2001

All publications resulting from research conducted at Hopland Research & Extension Center from 1951-2001.

Coyote Attacks: An Increasing Suburban Problem

Coyote attacks on humans and pets have increased within the past 5 years in California. We discuss documented occurrences of coyote aggression and attacks on people, using data from USDA Wildlife Services, the California Department of Fish & Game, and other sources. Forty-eight such attacks on children and adults were verified from 1998 through 2003, compared to 41 attacks during the period 1988 through 1997; most incidents occurred in Southern California near the suburban-wildland interface. Attack incidents are typically preceded by a sequence of increasingly bold coyote behaviors, including: nighttime coyote attacks on pets; sightings of coyotes in neighborhoods at night; sightings of coyotes in morning and evening; attacks on pets during daylight hours; attacks on pets on leashes and chasing of joggers and bicyclists; and finally, mid-day sightings of coyotes in and around children’s play areas. In suburban areas, coyotes can lose their fear of humans as a result of coming to rely on ample food resources including increased numbers of rabbits and rodents, household refuse, pet food, available water from ponds and landscape irrigation run-off, and even intentional feeding of coyotes by residents. The safe environment provided by a wildlife-loving general public, who rarely display aggression toward coyotes, is also thought to be a major contributing factor. The termination or reduction of predator management programs adjacent to some urban areas has also served to contribute to coyotes’ loss of fear of humans and to a dependency on resources in the suburban environment. Corrective action can be effective if implemented before coyote attacks on pets become common. However, if environmental modification and changes in human behavior toward coyotes are delayed, then removal of offending predators by traps or shooting is required in order to resolve the threat to human safety. We note the failure of various non-lethal harassment techniques to correct the problem in situations where coyotes have become habituated to human-provided food resources. Coyote attacks on humans in suburbia are preventable, but the long-term solution of this conflict requires public education, changes in residents’ behavior, and in some situations, the means to effectively remove individual offending animals.

Management of Conflicts Between Urban Coyotes and Humans in Southern California

An apparent increase in coyote-human conflicts, notably attacks on humans, demonstrates that such incidents are not rare in California. The authors discuss coyote attacks on 53 humans, resulting in 21 instances of human injury, over the last decade. These illustrate repeated, predictable pre-attack coyote behavior patterns. Specific changes in human environments and in human behavior that have contributed to coyote attacks are discussed. Case histories of attacks reveal contributing factors and suggest appropriate corrective and preventive actions. Padded leghold traps have been the most effective and efficient tool in removing problem coyotes and changing the behavior of coyotes to fear humans and the urban environment. Long-term solutions will require changes in human behavior. Humans must come to view large mammalian predators as a potential hazard. Increased public education is needed to improve methods of landscape management, refuse disposal, care of pets, and recognition of the need for predator management.