Until the 1990s, only two kinds of Orcas were seen in the inshore waters of British Columbia, he says: “resident whales,” which prefer delicacies such as salmon; and “transient whales,” which prefer to eat mammals such as porpoises and seals. The groups co-exist but don’t mix, socialize or mate, he explains.

But when the third kind of Orca appeared off Haida Gwaii on the Queen Charlotte Islands, scientists were puzzled. They were a complete mystery to scientists, particularly their eating habits. Then Ford and his team of scientists made a remarkable discovery: These whales love to eat shark. And that alone might explain the worn-down teeth.

original source: shark week comic

here are a few examples, click the link above for the rest:

this is my favorite part of the article hahaha: Using a combination of superior brain power and brute force, the highly-intelligent orcas are able to catch and eat what many think of as the ocean’s top predators.
i dunno who was responsible for writing that but sharks get no respect =(

here are the rest of the pics:
Smiling great white shark: underwater photographer Amos Nachoum gets close to Jaws

Great whites ‘plan’ seal attacks

click picture for article