Here's an image no swimmer would want to see in real life: a massive tiger shark with its jaws open, as if ready to devour an observer.
Though the picture makes it look like the photographer was the shark's next meal, no one was ever in danger, said David Shiffman, a doctoral candidate in marine biology at the University of Miami's Abess Center for Ecosystem Science and Policy, who posted the photo on Twitter (but was not on the boat at the time the photo was taken).
Image: Cat Schultz, RJ Dunlap Marine Conservation Program
