Leever

The Leever is a sand-dwelling plant creature known for its burrowing capabilities; the foe is found most often in desert climates, but has been known to live inside dungeons, spanning from the original The Legend of Zelda to Twilight Princess, changing little in terms of behavior and appearance since its first incarnation.

Characteristics
Leevers made their first appearance The Legend of Zelda, found in the deserts and beaches of the overworld, the locales of which that will carry on through the series as their trademark habitat. These ground-dwelling, cone-shaped creatures will burrow out of the ground, or remain at a semi-burrow as in The Adventure of Link, upon detecting movement and will begin pursuing territorial threats until they tire or vacate the proximity of intruders. Twilight Princess brings a certain graphical realism to the Leever, giving it a stronger plant-like appearance, not to mention a top-like shape, unlike the cone figure reminiscent of its most common incarnations.

Leevers are often fast-moving creatures,  only increasing their lethality in numbers; Leevers are almost always fought in groups, as many of these creatures target and hone in on Link at once in order to maximize the chance of inflicting damage and ridding their territory of threat.

Variations
Although the behavior of the Leever changes little between games, and even variations, they do seem to denote varying levels of vitality and strength by color. In The Legend of Zelda, there are two varieties of Leever, red and blue, with the blue type being the strongest,, a trend that carries on into A Link to the Past, where a standard green Leever and a slightly stronger purple variety co-exist.

Attack strategy is a second characteristic added to the different Leever variations, beginning with the species seen in Link's Awakening and on through to the Oracle series. These Leevers come in three colors: red, blue, or orange. The red Leevers travel in a straight line, while the blue variety tends to zig-zag at random intervals. The orange version is arguably the most difficult of the three, as it actively pursues Link, not to mention at an increased speed in comparison to its red and blue couterparts.

Weaknesses
The overall strategy to defeat any Leever, regardless of game, to attack it with the sword, or any quantifiable weapon used to defeat any other commonplace enemy. One to three hits should be enough to defeat any incarnation of Leever. Generally, Leevers can be dodged entirely, but in Ocarina of Time, Link becomes completely immune to their presence while riding Epona. In that same vein, their strength comes through attacking in numbers, meaning the fewer Leever there are in the surrounding area, the easier it will be for Link to dispell them.

Trivia

 * An interesting point to note is that when Z-targeting normal Leevers on Ocarina of Time, the targeter is green, instead of the normal yellow that targets enemies.
 * The Leever is one of the enemies, along with the Guay and the Stalchildren, that will procure a larger form after the defeat of a certain number of its standard species, in Ocarina of Time and Majora's Mask.