Two weeks after scientists confirmed the first-ever outbreak of avian influenza, or bird flu, in elephant seals along the California coast, the disease has spread to other marine mammals, researchers ...

After H5N1 bird flu was detected in elephant seals gathered at Año Nuevo State Park, other marine mammals have also succumbed, including a sea otter and sea lion. So far, only animals in San Mateo ...

Research has confirmed that avian flu has been detected in both a dead southern sea otter and a dead sea lion.

Explore seven jelly creatures found off the Oregon coast, from Velella velella and moon jellies to giant lion’s mane, with graphics showing size, stings and other key facts.

Wildlife authorities confirmed Thursday that nine more elephant seals, a sea lion and an otter have died from bird flu at Ano ...