Beamos

Beamos are stone statues with rotating heads and a single glaring eye. They will not hesitate to fire an energy beam at anything that makes eye contact with them.

Beamos originally appeared in A Link to the Past, where they cannot be destroyed, and only avoided. They lose track of Link if he hides behind another object.

In Link's Awakening they cannot be destroyed, but in addition to avoiding them and hiding behind other objects, their attacks can be reflected with the Mirror Shield.

In Ocarina of Time and Majora's Mask, they can be killed with a bomb or two. The heads will explode once the body has been destroyed. It takes two bombs to kill larger Beamos.

In The Wind Waker, Beamos react faster, and their beams can send Link flying. The most effective weapons are arrows, and while timing can be difficult, they can also be destroyed with a bomb. However, the glowing ball only appears right before, and during, the time it is firing its energy beam.

In Twilight Princess, they can be defeated by shooting them with the Hero's Bow in the eye, or by using a statue possessed by the Dominion Rod to smash them in the Temple of Time. They come in two variations, a larger brown type found in the Goron Mines and minor caves, and a thinner white type for in the Temple of Time.

Their most recent appearance was in Phantom Hourglass, in which they looked quite similar to how they did in A Link to the Past. This variant can be stunned by shooting it in the eye with an arrow or sending a Bombchu after it, but is otherwise invincible.