Armored Cannon Beetle
Granitus chukkulinae
The Armored Cannon Beetle is the mature stage of an Armored Cannon Beetle Larva. The beetle is first discovered during Olimar's first visit to the Pikmin planet. During his second voyage, only the larval stage is present. It is a large, metallic black beetle with a rounded thick shell of armor and a blowhole resting above its head. It attacks by inhaling through the blowhole and subsequently firing a rolling rock from its mouth, which will crush any of its smaller prey, such as Pikmin.
This creature is only found during Olimar's first visit in The Forest of Hope, where one is guarding the Radiation Canopy, and The Distant Spring, where one has ingested the Bowsprit.
How to kill
Pikmin
Throw them onto the beast's body, being careful of the rocks it releases. Stand to one side and whistle your Pikmin as the Armored Cannon Beetle begins to buck, or after it has thrown them off, then throw them back on.
Captain
Simply stand to one side and keep hitting with the "A" button, and it won't turn at all. Move away when it bucks, then return. There is a distance at which you can hurt the beast, but it won't hurt you, making the whole process easier, but this is relatively difficult to locate.