Big Skulltulas are enemies from Ocarina of Time.
These giant variety of the skull spiders are very territorial. Although very limited in movement, they pose quite the obstacle and are awkward to defeat. If Link attacks their front side, it makes them rock back and forth and potentially hit him. Only their backside is vulnerable, so wait until they turn around and strike them. Later on, Link can use the Hookshot or Longshot to defeat them in one hit from either side.