Cataquack
Cataquacks are duck-like creatures with no eyes that live on Gelato Beach and are easily angered. When they get angry they hurl Mario into the air. They can be both useful and dangerous. They are said to get nervous at strangers, but never want to harm them.
In Super Mario Sunshine, Cataquacks come in two colors, red and blue. The blue Cataquacks cannot damage Mario, but the red ones can. Both varieties are rather lazy and will fall asleep if left undisturbed. The red version is reportedly new to the area. However, as the game continues, more and more red Cataquacks are seen, as well as the number of the Cataquacks in general increases. In the end, only one blue Cataquack is remaining. By running into a Cataquack and getting thrown upwards, Mario can get high-floating coins. When sprayed with FLUDD, they turn over, and Mario can jump on them for an additional coin. However, they can only be truly defeated by Yoshi, or when getting catapulted into the air by the outburst of a nearby Dune Bud. In the eigth episode of Gelato Beach, The Watermelon Festival, Cataquacks have swarmed from the beach to the higher areas of the level. They hinder Mario from rolling the watermelon to the beach; when the rolling watermelon hits a Cataquack, it is thrown upwards and destroyed.
In the first episodes, Mario can get a Blue Coin by overturning the single red Cataquack and jumping on it, and in the last episodes, he can get a Blue Coin by doing so on the remaining blue Cataquack. Cataquacks may also randomly appear in the fight against King Boo in Hotel Delfino.
In Mario Kart: Double Dash!!, Cataquacks are revealed to come in purple and green varieties, in addition to the other red and blue colors. The game also reveals that they are also known as Pihanas (which is actually a Japanese name for them; one should note its use of "hana", the Japanese word for "flower"). They can be found on Peach Beach. When a kart runs into them, the car is thrown upwards, stopping the drivers and making them drop their items. The Cataquacks can be knocked out by Green or Red Shells, or Thunderbolts.
In Super Mario Galaxy, Cataquacks made a reappearance, but as helpers rather than enemies. Mario had to lead them out of fences and use them to fling him to high places. Only the blue variety was present in this game.
There is also a similar enemy called a Plungelo that looks like giant, red Cataquack with plunger-like feet, a smaller beak, and flowers on their heads. Frackles and Wrackles from Super Paper Mario bear a resemblance to them as well.