Walltula

Skullwalltulas (スタルウォール, Stalwall) haunt the vegetation of Ocarina of Time and Majora's Mask (although only one appears in the entire game of Majora's Mask). This arachnid creature clings on vines, waiting for enemies to climb up. If the enemy is deemed hostile or a threat, the Skullwalltula will flash purple and scurry over to the target, knocking it off the vine. The Skullwalltula resembles a Gold Skulltula in appearance (other than the skull plating, which resemble normal Skulltula), and they also make the same sort of scratching sound. They can easily be dispatched with any ranged weapon, including the Hookshot, Boomerang, and Bow, though the shock waves produced by the Megaton Hammer when it strikes the ground at the foot of a wall covered with Skullwalltulas will also work surprisingly well. It is usually necessary to destroy these creatures before climbing up a vine, as their scurrying attack is extremely hard, if not impossible in some places, to avoid.

Ocarina of Time
Skullwalltulas are found in many places in Ocarina of Time. Just about anywhere that there's a collection of vines that Link can climb up, there's a Skullwalltula waiting for him. Various places inside the Great Deku Tree, the Forest Temple, and other temples.

Majora's Mask
Skullwalltulas are a rarity in Majora's Mask. They only appear in a nearby hole near the giant tree with Skull Kid's drawing in Termina Field. There aren't many varieties of Skulltula found in Termina at all, so it's not much of a surprise to most.

Twilight Princess
Some spiders in Twilight Princess can be found clinging onto vines or ladders. Even though they act a lot like Skullwalltulas, they are called Walltulas, since they don't have the skull embedded on their backs.

Trivia
When a Skullwalltula falls to the ground, before its body burns, the Megaton Hammer can be used to make the creature bounce, as if killing it again. By this, it is possible to "juggle" a Skullwalltula's body on the ground indefinitely.