Goolix

Goolix was an enemy in the first Pikmin game. It resembles a blue water-blob with two nuclei (a blue one and a larger pink one). It moves to engulf Pikmin who happen to be in its path and digests them. The only Pikmin invulnerable to it are blue Pikmin, due to its watery nature. Its weak point is the smaller nucleus. If it is attacked, it will smack the nuclei together, knocking off all Pikmin on it. When it dies, it gets absorbed into the ground, leaving no trace it was ever there. It is only found in the Impact Site on odd-numbered days (even-numbered days will have the Mamuta instead).