Earlier this week, several New York state beaches were closed due to shark sightings. Fox News’ Rick Leventhal, speaking as part of Bill Hemmer’s “America’s Newsroom” show, reported on this story, claiming that “some onlookers ID’ed them as thresher sharks, they’re estimated to be about 18 feet long”. A half-eaten seal also washed up on shore nearby.
To his credit, Mr. Leventhal attempted to play down fears about these animals, saying that “Let’s not forget that sharks live in the ocean…as long as there’s food, they’re likely to keep hanging around”. However, I was immediately skeptical of the claim that a group of 18 foot long thresher sharks were swimming slowly just a few yards offshore. A cursory review of the known biology and ecology of thresher sharks will explain my skepticism.