Mega Duck

The Mega Duck is a mallard who has received too many breadcrumbs, becoming massive in the process. It is created when a drake in Falador Park or Lumbridge is fed 21 breadcrumbs within 20 seconds, note that this can be spread across multiple players, and is extremely difficult (if not impossible) to do alone.

By attacking it, it can be lured anywhere in the game that is not blocked by physical boundaries, and if brought by the ocean by Mobilising Armies, it swims off into the sunset with another gigantic duck, Mrs Duck. Luring Mega Duck to Mrs Duck also gives a 1 in 20 chance of receiving the Mega ducklings pet.

It has an extremely high number of lifepoints; possessing 100,000, and uses weak melee attacks. As its lifepoints are reduced, its defence raises significantly, and by the time it is reduced to under 1000LP, all attacks dealt to it will deal a measly one point of damage.