A rendering of Clavusodens mcginnisi, or “McGinnis’ nail tooth,” an ancient shark that stalked the ocean floor 340 million years ago. Rendering courtesy of the National Park Service A shark ...

During the studied period, for instance, hammerhead shark, blacktip shark and ragged-tooth shark sightings increased; tiger ...

Dr. Balchin said: "During the studied period, for instance, hammerhead shark, blacktip shark and ragged-tooth shark sightings increased; tiger shark sightings were stable, and bull shark and dusky ...