Mammothmon

Mammothmon is an evil Digimon in the anime, Digimon. He resembles a mammoth, but with only one eye

Digimon Adventure
Mammothmon first appeared as one of Myotismon minions. He went on a rampage throughout the city and destroying objects in his path. Birdramon Digivolved to Garudamon and defeated Mammothmon.

Digimon Adventure 02
Arukenimon created an army of Mammothmon from Control Spires. They were easily wiped out by BlackWarGreymon one by one.

Digimon Data Squad
When Gotsumon spotted the DATS on the run, he summoned Mammothmon and made an avalanche at the DATS, making them fall into the abyss below. He was defeated by Lilamon.