Several very active killer whales put the fright into sea lions recently near Tofino, British Columbia. But those who watch the accompanying footage may detect that the presence of so many large predatory cetaceans made some surfers very nervous as well.

[Related: Five unlikely spots you'd never think to surf.]

The footage, captured at a picturesque point break outside Tofino, was uploaded Monday by Adam Chilton, who did not respond to a YouTube message requesting more information.

But those are transient killer whales, which prey largely on marine mammals, such as sea lions. And those are some brave surfers, even though killer whales have never been known to attack humans in the wild.