When biologists in Massachusetts placed tracking tags on porbeagle sharks, they hoped to learn more about the massive hunters’ habitats. What they got was a murder mystery. The victim was a ...

great white sharks in 2005; oceanic whitetip, smooth hammerhead, scalloped hammerhead, great hammerhead, and porbeagle sharks, plus all species of manta rays, in 2014; and thresher and silky sharks ...

An annual survey of marine animals has counted the fewest basking sharks in its 20 years. Ex-fisherman Peter Williams says it was rare to see a porbeagle shark swimming so close to the boat.