Remembering Eric York 1970-2007
Many of Eric York's colleagues and friends throughout the National Park Service contributed to this memorial.
A Biologist's Biologist
With the passing of Eric York on November 2, 2007, Grand Canyon National Park lost an extremely talented and dedicated wildlife biologist. More importantly, the mountain lions, carnivores and other wildlife he studied lost one of their most knowledgeable and devoted human allies and advocates. Eric’s work, in fact his life, centered on his passion for wildlife, the outdoors, and grand landscapes of our national parks and other wildlands.
Eric worked at Grand Canyon National Park as a wildlife biologist studying carnivore movement patterns from July 2006 until his death, and previously as a contract biologist starting in 2003. He previously worked for Santa Monica Mountains National Recreation Area in California, Lake Clark National Park and Preserve in Alaska, the U.S. Geological Survey Biological Resources Discipline and the University of California–Davis’Wildlife Health Center on mountain lions and other large carnivores, specializing in livecapture techniques. Eric worked at Santa Monica Mountains NRA for more than 10 years and was critical to the establishment of their carnivore research program, which focuses on the ecology, behavior and conservation of bobcats and coyotes in that complex urban environment. In 2002, Eric initiated a project using global positioning satellite radio collars for the study of mountain lions in that park.
Grand Canyon Lion Study
Beginning in 2003, the National Park Service participated in a radiotelemetry study of mountain lions within the Grand Canyon ecosystem to complement existing studies using remote cameras, track surveys, and scat and hair collection.
An additional component of Eric's work for Grand Canyon’s Division of Science and Resource Management was his active collaboration with interpretive staff for outreach and education about his research on lions in the park.
In 2007, Eric was monitoring up to 10 collared lions in and around Grand Canyon National Park, and also collecting data on bighorn sheep, black bear, bobcats, coyotes and other species. Two of the collared female lions produced litters in the summer, and Eric found the kittens, which he ear-tagged to incorporate them in the study. A few days prior to his death, he found the mother of one of these litters dead and recovered her body to perform a postmortem examination. The Centers for Disease Control and Prevention confirmed pneumonic plague as the cause of Eric's death. With the detection of the same strain of plague in the remains of the necropsied mother lion, the CDC concluded that Eric contracted the disease from the animal. Although plague can be transmitted to humans through the bites of rodent fleas, Eric's exposure likely came through direct contact with the infected lion. Plague is endemic in northern Arizona, but cases of pneumonic plague in humans are extremely rare. Eric's death reminds us of the inherent hazards, including the less obvious ones, that biologists are exposed to while working to manage and conserve wildlife.
Eric will be remembered as a biologist's biologist, and his expertise went far beyond that of his intimate knowledge of the lions and other species he tracked at Grand Canyon and elsewhere. During his career, Eric captured and tagged 23 different species of carnivores. He worked in many areas of the United States and the world, including Chile, Nepal and Pakistan, where he researched the elusive snow leopard.
In her comments made at the celebration of his life held on the canyon's South Rim on November 15, 2007, Elaine Leslie, Eric's former supervisor, said, "Eric was much like the lions he stalked. To catch a glimpse of the elusive Eric, you needed to be up at dawn as he hurried in and out of the office to gather up his freshly charged radio, dart pistol and other tools of the trade. By sunrise you could find him on the carcass of a freshly killed deer or elk, carefully reading the signs and placing a snare. Then off he would run, yes run, to check his traplines." She also said, "If you couldn't be Eric York, you at the very least wanted to hang out with him in the field and absorb every ounce of skill the man had to offer."
Grand Canyon Mountain Lion Program Archive
Animal Check Lists
Amphibians of Grand Canyon NP (31kb PDF File)
Birds of Grand Canyon NP (154kb PDF File)
Fish of Grand Canyon NP (36kb PDF File)
Mammals of Grand Canyon NP (69kb PDF File)
Reptiles of Grand Canyon NP (52.5kb PDF File)
Grand Canyon Invertebrate Species Collection (1.7MB XLS File)
Grand Canyon Vertebrate Animal Species List (223kb PDF File)
Grand Canyon Threatened & Endangered Species List (52kb PDF File)
Arizona Game and Fish Web Site