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Quagsire is a light blue, bipedal, amphibious Pokémon. Its head is broad and round, having little neck to distinguish it from the rest of its body. It has a wide mouth and tiny, black eyes. A wavy, purple stripe runs down its back. Along its spine is a dark blue fin, which is larger on the male than on the female. Quagsire's hands and feet both have three digits. Its outer layer of skin is slimy and slippery. Quagsire shares many similarities with its Paldean relative, .

Quagsire is carefree and sluggish by nature, although it is protective towards Wooper. An unintelligent Pokémon, it tends to bump its head inadvertently while swimming and seems not to care. It hunts for food by leaving its mouth wide open in water and waiting for its unaware prey to blunder in. Because Quagsire does not move, it does not get very hungry and can afford to wait for its food. As shown in Pokémon Sleep, Quagsire leaves its mouth open even as it sleeps. It is said seeing a Quagsire asleep with its mouth wide open is a sign it's possibly waiting for prey, while it dreams. Quagsire lives in clean bodies of freshwater, as well as muddy swamps. During the day, Quagsire avoids sunlight by submerging itself in the water.

In the Pokémon the Series episode Once in a Blue Moon (EP129), wild Quagsire are shown to have an annual celebration at Blue Moon Falls when the moon is full. There they attempt to shoot round objects they have collected to the top of a waterfall with their attacks, to see who can launch their objects the highest, with the apparent target being the moon.

Evolution
Quagsire evolves from .

(Source: Bulbapedia)