The groupers, fat and about two feet long, are not alone: Hundreds of gray reef sharks assemble as well ... Seen live, the attack is a frenzy that explodes before us. Only later, thanks to ...

Like something out of a nightmare, the sharks in this video from NowThisImpact’s YouTube channel suddenly explode into a feisty feeding frenzy. But what triggers this sudden burst of aggression?

Footage from the feeding frenzy shows around eight sharks ripping at the remains of a dead whale calf while seabirds fly above, ready to snatch their share. Scientists from Stellwagen Bank ...