Armos

Armos are stone statues which if you touch them, will come to life and attack you.

The Armos has been around since the very first The Legend of Zelda game, and after that has appeared in various other Zelda's, like A Link to the Past, Ocarina of Time, Majora's Mask and The Wind Waker.

The methods of killing one vary from game to game: in LoZ, the best way was to just slash it with your sword. In aLttP, they were most vulnerable to arrows. In OoT as Young Link, and in MM, you could either bomb them or throw a Deku Nut, then slash with your sword. As Adult Link in OoT, you could just cut it. In tWW, you had to cut the red orb on its back, which was made a lot easier by stunning it with an arrow. Note that in all 3D Zelda's, after killing one, they'd charge at you, and in the N64 Zelda's, they'd blow up after their charge.