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Researcher Helps Tag Suspected Killer Shark in Costa Rica

The 14-foot tiger shark began circling Todd Steiner and the team of divers in the waters off Costa Rica — a sign of aggressive behavior from a marine predator that was already suspected of killing an American diver in 2017.

Swimming just feet away from the shark, Steiner thrust a 6-foot pole at the shark’s scarred dorsal fin to implant an acoustic transmitter. The transmitter will be be used to track the shark’s movements and hopefully protect future divers in the tropical waters he and thousands of other divers have come to cherish.

“You’re working on adrenaline at that point,” said Steiner, the executive director of the Olema-based Turtle Island Restoration Network. “By the same token, it was important to get that data so I was driven by

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