Boulder

Boulders are a recurring enemy in The Legend of Zelda series. They are simply large rocks that fall from a higher point and try to either land or roll into Link, usually resulting in a great deal of damage. There is no way to defeat Boulders, and they must simply be averted.

The Legend of Zelda
Boulders first appear atop Death Mountain, falling in random patterns to damage Link. They are an orange color, and fall continuously until Link leaves the area. These rocks are usually accompanies by other enemies such as the Octorok or Zola, making them harder to avoid being that Link is distracted by other creatures.

The Legend of Zelda: A Link to the Past
Here, Link notices the Boulders have taken on a different appearance. They are slightly larger than before and colored green. They appear again on Death Mountain with a very similar attack pattern of falling into Link.