When your body reaches nearly 20-metres long, whale sharks need to be flexible when choosing how best to snare their sizeable meals.

With the help of dorsal fin-mounted cameras and dozens of research papers, scientists discovered the biggest fish in the sea is a keen snacker and has developed several novel ways of securing a feed.

Researchers identified 36 individual feeding behaviours among whale sharks and labelled them "serial snackers" for unusual mealtime habits.

Whale sharks were filter feeders whose prey mostly consisted of plankton and tiny animals like copepods, Australian Institute of Marine Science study lead author Christine Barry said.

"It's not surprising the biggest fish in the oceans is so food oriented, given they eat some of the smallest prey," Ms....