Tektite

Tektites are one-eyed spider enemies who appear in nearly every The Legend of Zelda series title, starting with the titular The Legend of Zelda. Their main habitat is at mountain ranges, although they sometimes appear in dungeons as well. Tektites are noted for their high-jumping ability, which often makes it difficult for Link to attack them.

The Legend of Zelda
Tektites appear in orange and blue, depending on their strength. Aside from the mountains to the north, they notably appear one screen east of the main spawn area, making them one of the first enemies able to be encountered, along with Octoroks. They hop around the screen, and can jump onto walls just as well as solid ground.

Zelda II: The Adventure of Link
They only appear in blue. They bob slowly up and down behind their legs (which are actually a separate layered graphic) and occasionally jump.

The Legend of Zelda: A Link to the Past
They appear in indigo and red on the east peak of Hebra Mountain, and are somewhat larger than before. In fitting with the game's strength/color system, the red ones are now the stronger ones.

The Legend of Zelda: Link's Awakening
They appear primarily near the river south of Tal Tal Heights and north of the Rapids Ride. Their graphic is simplified to showing them at the front, therefore only showing two legs. In DX, they are colored red.

The Legend of Zelda: Ocarina of Time
They appear in red on Death Mountain Trail and blue near Zora's River and Lake Hylia. It is shown that Tektites can float on water due to the latter's location. They hop slowly after Link if they spot him, and will even hop from higher ground onto him. If the Megaton Hammer is hit against the ground near one, it will helplessly flip onto its back.

The Legend of Zelda: Majora's Mask
Only Blue Tektites appear, specifically in Snowhead. In the winter, they sometimes hide under the snow, with only white puffs rising from the spot they hide being visible. Other ones are trapped inside snow boulders.

The Legend of Zelda: Oracle of Seasons/Ages
They appear in both Holodrum and Labrynna in orange and blue, the latter typically being found in Winter or the past.

The Legend of Zelda: Four Swords
They appear white with a red spike on top and are randomly-generated. They act like most prior 2D appearances.

The Legend of Zelda: Four Swords Adventures
They resemble a more-detailed version of their A Link to the Past appearance, and act roughly the same. The indigo ones are now blue.

The Legend of Zelda: The Minish Cap
They resemble their appearance in Four Swords, but can have a blue spike as well. They appear around Mount Crenel, with the blue ones appearing on the west peak. Later, red Tektites can be found in the Wind Ruins. A Golden Tektite can appear after certain Kinstone fusions. At the end of the game, after Zelda makes her wish, the Tektites, red and blue, and shown vanishing one by one from Mount Crenel's west peak.

The Legend of Zelda: Twilight Princess
They appear in both red and blue and resemble more detailed versions of their Ocarina of Time designs. However, there is actually no difference between the strengths of the colors. Red ones initially appear in a water-filled room in Goron Mines, and blue ones later appear in the same room when Link comes through it again later. Red ones later appear in northern Hyrule Field. When they are defeated, clear liquid can be shown gushing out from their severed legs, potentially their blood.

The Legend of Zelda: Phantom Hourglass
They appear as entirely red or blue with a large yellow eye. Unlike previous bird's-eye-perspective games, they actively jump at Link. Their design has a spike on top, resembling the Four Swords design.

The Legend of Zelda: Spirit Tracks
They are gray and inhabit caves. They can only be encountered when in the Spirit Train. They can appear in the caves alone, or assisting an enormous Rocktite as it pursues the train. Instead of leaping, they scuttle along the sides of the caves' circular walls.

The Legend of Zelda: A Link Between Worlds
They appear in blue and red and resemble their A Link to the Past design. They now move their eyes towards Link when they see him, and can skitter around without jumping if they are close to him.. They also appear outside the Eastern Palace. Blue ones appear in Hyrule, while red ones live in Lorule on the snowy Death Mountain. Five of each color are found on the 8th floor of the advanced challenge of the Treacherous Tower.

The Legend of Zelda: Tri Force Heroes
They appear as they do in A Link Between Worlds, but only in blue. They now sometimes hop along raised platforms, necessitating a totem position to defeat them. They can also leap along the surface of water. Tektite Shells appear as treasures.

The Legend of Zelda animated series
They appear as four-eyed blue spiders that can spit webs.

Link: The Faces of Evil
Tektites appear in Militron and simply wander back and forth along the ground to attack. They are blue and have six legs.

Zelda's Adventure
Tektites appear in various areas, scuttling about. They have four legs, like in most games, and come in red and blue. Deelers act essentially as burlier versions of them.

Cadence of Hyrule: Crypt of the NecroDancer featuring The Legend of Zelda
In Cadence of Hyrule: Crypt of the NecroDancer featuring The Legend of Zelda, Tektites of several colors make an appearance as an enemy. They move to spaces in a diagonal direction.