Billions of Blue Velella velella Wash Ashore in California's Rare Spring Event

Billions of translucent, cobalt-blue sea creatures known as Velella velella are washing up along California’s coastline. The mass stranding stretches from the Bay Area down the state’s shores, covering beaches in an unusual springtime spectacle. This year’s event is far larger than normal, drawing attention from locals and scientists alike. The creatures, often called 'by-the-wind sailors,' are hydrozoans—colonies of tiny organisms working together. Each has a stiff, triangular sail atop an oval body, allowing them to drift with the wind. Unlike most marine life, they cannot swim or steer themselves, leaving them completely at the mercy of wind and waves.

Most *Velella velella* in the Northern Hemisphere are 'left-handed,' meaning their sails angle left. This usually keeps them offshore. But when winds shift toward land, entire populations are pushed onto beaches. Recent spring storms and strong winds have driven them ashore in record numbers. These strandings often increase during El Niño years, as warmer waters carry the tropical-leaning creatures further north. Once stranded, they dry out quickly, turning white like 'cellophane candy wrappers.' Within days, they emit a strong, fishy smell. While their stinging tentacles pose little threat to humans—usually causing just a slight tingle—they can irritate the mouth or stomach if ingested. Dogs that eat them may suffer gastrointestinal distress or irritation.

The annual spring strandings of Velella velella are not uncommon, but this year’s sheer volume stands out. Their presence serves as a visible reminder of how wind and ocean currents shape coastal ecosystems. For now, beachgoers are advised to avoid handling them and to keep pets away.