Ocarina of Time
Skullwalltulas are small, white spiders with a big skull as their abdomen. They are mostly found on vines and walls. They do not pose a great threat, unless Link climbs up a certain wall where they block his path. They can be easily defeated with any ranged weapon. If Link attempts to avoid them, there is a chance that they will charge against him, knocking him off the wall.
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Skullwalltulas in Majora's Mask behave identically to the ones in Ocarina of Time.