If you find a dead bird near your home, please report it to the California West Nile Virus and Dead Bird Call Center online (https://westnile.ca.gov/) or call 1-877-WNV-BIRD. Your reports help track and prevent West Nile virus (WNV) in California.

Why report dead birds?

Dead bird reports are often the first sign that West nile virus is active in an area, and the reports help track West Nile virus throughout the year. Wild birds are the main source of West Nile virus for mosquitoes. When certain birds become infected with West Nile virus, they will have West Nile virus in their blood. If a mosquito bites an infected bird and feeds on its blood, the mosquito can become infected and pass the virus on to people or other animals that it bites. Not all birds that are infected with West Nile virus will get sick, but West Nile virus can make some birds very sick and even cause death. Signs of West Nile virus in birds may include uncoordinated movement, a lack of energy, and difficulty breathing. Corvid birds (such as crows, jays, ravens, and magpies) are the most likely to get sick and die from West Nile virus.

What happens when you report a dead bird?

If you call the hotline, a California Department of Public Health (CDPH) staff member will take down information about the bird. If you submit a report online, the CDPH may call you for additional details. The CDPH determines if the bird is ‘testable’ depending on the condition of the carcass and whether it is a species likely to have died from West Nile virus. The CDPH shares the information with San Mateo County Mosquito and Vector Control District. The District sends staff out to collect the bird and bring it back to the District lab for testing. If the bird tests positive for West Nile virus, the District conducts additional surveillance activities.

To learn more about WNV, visit https://westnile.ca.gov/faq.php

What about reporting other odd wildlife happenings?

• If you’ve found a wild animal that appears to be sick, injured, or orphaned, please visit: https://phs-spca.org/wildlife/found/
• If you’ve found a dead wild animal other than a bird, please visit: https://wildlife.ca.gov/Conservation/Laboratories/Wildlife-Health/Monitoring/Mortality-Report
• If you’re interested in reporting another kind of wildlife incident, please visit: https://apps.wildlife.ca.gov/wir

Page last reviewed: July 7, 2025