Surfrider Foundation, an environmental group in California, found a dead venomous yellow-bellied sea snake after it washed ashore.
The snake was found 30 miles from Los Angeles at Bolsa Chica State Beach.
It was captured on film in a video showing Surfrider Foundation's annual beach cleanup.
The group wrote: “There is belief that the El Niño temperature change could have enticed the creature to swim north in search of small fish and eels, which they use their venom to paralyze.
"This is the third documented record of this species in California," according to the group. "The first one was Thanksgiving Day in 1972 at San Clemente Beach. The second one was at Silver Strand Beach in Oxnard (earlier) in 2015."
Greg Pauly, assistant curator of herpetology at the Natural History Museum of Los Angeles County, told ABC News that it is rare for a person to die from a bite from one of the snakes because their mouths are small. Pauly said that despite that, anyone who sees a snake like this should avoid it.
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