From the Super Mario Wiki, the Mario encyclopedia
Sled Creatures are enemies that appear in Wario World. They are short, big-headed snow beasts found slaloming down the snowy slopes of Shivering Mountains in infinite numbers. Wario cannot damage them or affect their paths in any way using any of his attacks, but they cannot damage Wario either. However, Wario will be pushed away a significant distance if he is hit by one, which may hit him off of the mountain into Unithorn's Lair.
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