Hundreds of dead seabirds are washing up on Southern California beaches from Ventura County to San Diego, leaving wildlife experts scrambling for answers as the mysterious die-off continues into its third month with no clear explanation.

Unprecedented Numbers Alarm Officials

Beachgoers reported finding at least eight dead birds along a 1.5-mile stretch in Long Beach, while one visitor to Ellwood Beach in Santa Barbara counted 14 carcasses during a single walk. Long Beach lifeguard officials confirmed finding approximately 30 dead birds in one day, a volume they described as unusually high compared to normal beach conditions. International Bird Rescue, a nonprofit wildlife organization based in San Pedro, reported receiving roughly 40 calls daily about dead birds starting March 1, quadruple their typical volume of 10 calls per day.

Experts Rule Out Common Culprits

Wildlife officials quickly investigated and eliminated several potential causes. Testing ruled out avian influenza as the culprit, despite initial concerns about bird flu. Researchers also examined whether harmful algal blooms, commonly known as red tide, could be responsible but found no direct connection to the dead seabirds. Some locals theorized that offshore oil operations near the THUMS Islands might be contaminating birds diving for food, but CEO JD Bergeron of International Bird Rescue confirmed the birds showed no signs of oil exposure.

Ocean Heat Wave Emerges As Leading Theory

The strongest explanation points to a Pacific Ocean marine heat wave called The Blob, which experts believe is disrupting fish migration patterns. Warming ocean temperatures are forcing prey species into colder, deeper waters, leaving seabirds unable to find adequate food sources. Bergeron told investigators that water temperature appears to be a significant factor in the die-off. The NOAA Integrated Ecosystem Assessment Program has tracked The Blob for years as it affects marine ecosystems along the California coast. Meanwhile, residents face delays in carcass removal, with Long Beach Animal Care Services classifying dead animal pickups as non-emergency calls requiring 24 to 72 hours for response crews to address.