The rare footage, which has received more than 1.5 million views on YouTube
, was shot by the nonprofit environmental organization Conservation International
in Indonesia's Cendrawasih Bay.
Researchers were looking to tag whale sharks
, the world's largest fish, but they got an extra treat when they witnessed-- and filmed-- one of the filter-feeding fish sucking bait fish through a fishing net.
It's not only small fish that get sucked into the giant's jaws; according to Discovery News, a photographer nearly got swallowed
by a whale shark near Isla Mujeres, Mexico last year.
But whale sharks don't eat or attack people; they are graceful, gentle giants.
Here's the video: