Tag Archives: mortality

CDFW Investigating Die-Off of Desert Bighorn Sheep

Wildlife biologists from the California Department of Fish and Wildlife (CDFW) are investigating what appears to be a significant mortality event associated with respiratory disease among the San Gorgonio desert bighorn sheep population in Riverside County. CDFW has confirmed that at least 20 animals have died but suspects that total mortality may be greater.

“The significance of this outbreak to the San Gorgonio desert bighorn sheep population is being investigated,” explained Heidi Calvert, an environmental program manager with CDFW’s Inland Deserts Region. “Our top priority right now is to determine the source and nature of the disease so that we can identify the right management actions to mitigate future risk.”

CDFW staff began receiving reports of sick desert bighorn sheep in December 2018 and immediately began collecting samples for lab analysis. CDFW is continuing to survey and monitor the population to gather more information on the extent and magnitude of this loss to the population. Private landowners and partner agencies are assisting with this effort.

The Western Association of Fish and Wildlife Agencies Wild Sheep Working Group considers respiratory disease to be “the biggest impediment to restoring and sustaining bighorn sheep populations.” Respiratory disease in bighorn sheep is most commonly attributed to contact and/or proximity with domestic sheep and, to a lesser extent, domestic goats. Diseases that originate with domestic animals can pose a significant risk to bighorn sheep populations.

The affected desert bighorn population is located within Desert Bighorn Sheep Hunt Zone 5. The recent die-off will likely result in reducing the two hunting tags to zero in this zone for 2019.

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Media Contacts:
Heidi Calvert, CDFW Inland Deserts Region, (760) 872-0751 

Kirsten Macintyre, CDFW Communications, (916) 322-8988

Attorney General Becerra and the California Department of Fish and Wildlife Issue Legal Advisory on Migratory Bird Treaty Act

California Attorney General Xavier Becerra and the California Department of Fish and Wildlife (CDFW) today jointly released a legal advisory regarding the federal Migratory Bird Treaty Act (MBTA) and California’s protections for migratory birds. The advisory affirms that despite any reinterpretation of the MBTA by the federal government, California law continues to provide robust protections for birds, including the prohibition on incidental take of migratory birds.

The advisory – and a lawsuit filed by Attorney General Becerra as part of a multistate coalition in September 2018 – follows a decision by the federal government to roll back protections under the MBTA. The MBTA protects more than 1,000 native U.S. species of birds, including the bald eagle, America’s national bird, and other bird species that were near extinction before MBTA protections were put in place in 1918.

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Media Contacts:
Jordan Traverso, CDFW Communications, (916) 212-7352
Press Office for Attorney General Becerra, (916) 210-6000