Largest venomous snake in U.S. spotted swimming off Florida Keys

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The captain of a charter boat who was fishing off the Florida Keys spotted a deadly species of rattlesnake swimming in the ocean.

Instead of finding fish, Ted Wilson found a five-foot Eastern diamondback snake, which is the largest venomous snake in North America, according to National Geographic.

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Wilson took cellphone video of the snake, and told WSVN that it was swimming toward the boat and "appeared to be island hopping."

“I’ve never seen a rattlesnake in the Keys, much less a five-footer swimming in the middle of open water,” a person can be heard saying in the video. It has been viewed more than 150,000 times on Facebook.