13/10/2015 16:16 BST | Updated 14/10/2015 12:59 BST

Stunning Video Captures Divers' Rare Encounter With Sunfish

Divers exploring the coast of Portugal have had a close encounter with one of the world's heaviest fishes known as the sunfish or Mola.

The divers looked like ants swimming alongside the fish, which can grow up to 5000 pounds.

Surprisingly, the large creature stayed amazingly still as the group of swimmers took their fill of images and videos.

Mola means millstone in Latin and it refers to the fish's circular shape.

In their largest form, they can grow up to 14 feet long measuring 10 feet across.

In addition to their arresting physical features, they also have an interesting relationship with their surroundings.

Mola skin can often become infested with parasites and in order to keep themselves clean they invite birds and other fish to feed off the pests.