Video posted to YouTube shows the goliath grouper swallowing the 4-foot shark in one bite.
The footage was shot by some fishermen who were trying to reel in the black tip shark off Bonita Springs.
"Oh my god! He just grabbed the freaking fish!" one of them can be heard exclaiming in the video.
It was posted two days ago and already has more than three million hits.
LINK: Watch the video on YouTube
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