Cat poop runoff suspected in California sea otter deaths.

A rare strain of toxoplasmosis, never before reported in aquatic animals, has killed at least four California sea otters. The parasite, first seen in Canadian mountain lions in 1995, had not been previously detected on the California coast. The parasite is concerning due to the effects it could have on the population of the threatened species as well as the risk to other animals. It could pose a public health risk if it contaminates the environment and marine food chain. The parasite is often found in cat feces, and otters can be exposed to it in rainwater runoff.