Meet our Guests: Peter Sanzenbacher

Peter Sanzenbacher

Wildlife Biologist, U.S. Fish and Wildlife Service

Shoshone, CA

11/16/21

     Wearing an out-of-place New England Patriots hat in the Mojave Desert near the town of Shoshone, California, Peter Sanzenbacher shares his main project for the past four years or so: conserving the California condor, an iconic species of the Western United States. He says that this species, which almost went extinct in the wild in the 1970s, faces difficulties surviving amidst a rapidly developing world. Today, the main cause of condor mortality on the landscape is lead poising, ingested from people shooting wildlife and condors scavenging the carcasses. However, another particular threat to the species has turned out to be the wind energy industry. As more and more turbines pop up, they become dangerous obstacles for birds that call breezy areas their home.

     As a wildlife biologist with the U.S. Fish and Wildlife Service, Peter attempts to bridge the gap between condors and hunters and wind businesses alike. He makes sure to emphasize that he is working with industry in partnership, not fighting against it. In conversation, Peter shares a guiding question of his recent work: “how do we approach this in a way where we can protect condors and have a source of renewable energy on the landscape?” Peter hopes his work can be a model for other regions encountering the conflicts between species conservation and green energy.

By Ruthie Colburn

Meet our Guests: Kerry Holcomb

Kerry Holcomb

Biologist, U.S. Fish and Wildlife Service

Mojave Desert, CA

11/12/21

     Deep in the Mojave Desert, giant boulders are playfully stacked atop one another while Joshua trees tilt and dance in the mid-day sun. The scene fits better into a Dr. Seuss novel than a modern-day conservation story.

      Amidst the fantasia, Kerry Holcomb, a biologist for the U.S. Fish and Wildlife Service (USFWS), proclaims, “you can’t do conservation if you ignore the human element.”

      After moving from Appalachia to the desert, Kerry turned his focus to the endangered desert tortoise. At one time, desert tortoises were the dominant herbivores on the landscape, sequestering carbon and changing the mosaic of plant communities. But now, Kerry explains, “we have functionally extinct populations [of desert tortoises] in parts of the Mojave.” And he believes ravens are to blame.

     Thanks to the advent of the air conditioner, non-native people started settling in the desert, and raven populations began to multiply rapidly. Ravens are generalists, meaning they can adapt to a wide range of ecological conditions. Ravens adapted well to their new food source at landfills and as their populations soared, they added the desert tortoise to their menu as well.

     Both ravens and tortoises are holy to the Mojave and Chemehuevi people, but Kerry explains, “the Tribes see the dichotomy of the tortoise being higher than the ravens.”

     In a desperate attempt to save the desert tortoise, the USFWS has resorted to oiling, which causes suffocation of raven eggs to diminish their population. But, with new houses popping up in the desert every day, Kerry recognizes that the desert tortoise has a human problem, not a raven problem.

By Josh Matz