Big Wiggler

Mega Wigglers are a sub-species of Wigglers that appear in New Super Mario Bros. Wii. They are five times the size of a normal Wiggler (but they're not bigger than the Super Mario Sunshine's Wiggler) and live beneath the ground in places where it has acid pits. Despite being enemies, they can help Mario get the items in places of high range. For this, the player must jump over a Mega Wiggler and press the button 2 to do a high jump, as if he were using a Spring.

Mega Wigglers cannot be defeated and they'll hurt Mario by running into him. They can also defeat Swoopers. Also, they don't get angry if Mario jumps atop it.