Geegant

The Geegant is a smaller member of the krukadon family, comparable in size to an adult Bulbmin. It has yellow skin, a thick brown hide, a large mouth, several sharp fangs, small eyes, two stubby arms that each end in a single large claw, a pair of backwards-jointed legs which are protected by a defensive growth at the hip, three clawed toes on its feet, and a large tail. It hunts prey, such as Pikmin and leaders, by quickly hopping towards them and attempting to bite them. It can eat three Pikmin at once. To attack the Geegant, Pikmin must first be thrown onto its head to flip the creature over and force it to expose its vulnerable underside.

In Pikmin: Guardian
In Pikmin: Guardian, the Geegant burrows underground and never completely unearths itself until it is defeated. The Geegant only exposes its head from the ground to view its surroundings and its prey. Once it seizes an opportunity to attack, the Geegant will rush its foe at startling speeds and attempt to eat them. The Geegant serves as the boss of two caves: it is fought alone in one, and three are fought simultaneously in the other. Purple Pikmin and Orange Pikmin are recommended to battle the Geegant with.

In Pikmin X: Deep Freeze
Geegants in Pikmin X: Deep Freeze behave like a combination of both their Pikmin: Shadows of the Future and Pikmin: Guardian incarnations. They mostly appear in the Unfamiliar Valley as moderately-threatening enemies. It visibly burrows into the ground while on the prowl for food and will emerge when approached, followed by it hopping towards Pikmin to try and gobble them up. Like in Shadows of the Future, it can only be attacked if it is flipped over by a well-thrown Pikmin onto its back; when it gets back on its feet, it scatters the Pikmin away by burrowing into the ground for a moment before reemerging. If left alone, it will return underground.