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The environmental group said the snake may have washed up on the shore due to warmer waters related to the El Nino weather event.

\"They can swim backward and forward and can stay underwater for up to three hours,\" the group wrote on YouTube. \"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.\"

The snake was already dead when it was found by beachcombers.

\"PHOTO:
SurfriderFoundation/Facebook
PHOTO: Surfrider Foundation in San Clemente, Calif. posted this photo of a poisonous sea snake to their Facebook on Dec. 19, 2015.
>

In October of this year another yellow-bellied sea snake was found on another Southern California beach. While that snake was found alive, it died shortly thereafter.

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 get a lethal dose from these snakes because their mouth is so small and they usually prey on small fish. However he recommended people keep their distance from the animal.

Pauly said the snake is normally found in tropical waters, but the warmer temperatures likely mean there are more snakes in the region.

\"We were expecting this,\" Pauly told ABC News in October. \"It's a rare event, but it was also somewhat predictable given that we are currently experiencing a fairly dramatic El Nino year.\"

ABC News' Emily Shapiro contributed to this report.

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