Killer whales have a friendlier image than great white sharks. (Perhaps because of their respective portrayals in movies: Jaws 2 even begins with the beached carcass of a half-eaten orca.) But orcas are “potentially the more dangerous predator,” says Toby Daly-Engel, a shark expert at the Florida Institute of Technology. “They have a lot of social behaviors that sharks do not, which allows them to hunt effectively in groups, communicate among themselves, and teach their young.”
Combining both brains and brawn, orcas have been known to kill sharks in surprisingly complicated ways. Some will drive their prey to the surface and then karate chop them with overhead tail swipes. Others seem to have worked out that they can hold sharks upside-down to induce a paralytic state called tonic immobility. Orcas can kill the fastest species (makos) and the largest (whale sharks). And when they encounter great whites, a few recorded cases suggest that these encounters end very badly for the sharks.