Mammoth Dense

Mammoth Dense (マンモスデンス) is a creature developed by the Golden Lion Pirates' doctor Indigo using the SIQ for Shiki's plan to overthrown the World Government by destroying the East Blue.

It appears in One Piece Film: Strong World, being used by Zoro and Chopper to travel around a winter island in Merveille. Another one was seen attacking the village in Merveille with other animals.