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North American river otter spotted on California coast after 150-year absence

Wildlife researchers have documented a North American river otter on California's San Mateo coast, marking the first confirmed sighting in over a century. The unexpected discovery was made through camera traps initially deployed to monitor local fox populations.

LSN India · 9 November 2026

North American river otter spotted on California coast after 150-year absence

A North American river otter has been photographed at California's Cloverdale Ranch Open Space Preserve, representing a significant milestone for the region's wildlife recovery efforts. The sighting, captured on wildlife monitoring cameras, is the first documented presence of the species on the San Mateo coast since the 1800s, when the animals were hunted to near extinction across North America.

Researchers had installed the camera traps with the primary objective of tracking fox activity in the preserve. The unexpected footage of the river otter suggests the animal may have traveled considerable distances through California's waterways, potentially moving northward from populations that have recovered in other parts of the state in recent decades.

The appearance of the river otter holds implications for local ecosystem health. Conservationists view the sighting as an encouraging sign that habitat restoration efforts and protections enacted over recent years may be creating conditions suitable for species recovery in the region.

River otters are considered an indicator species for healthy freshwater and coastal ecosystems, as they require clean water and abundant fish populations to survive. Their presence at the preserve suggests improvements in water quality and aquatic biodiversity along the San Mateo coast.