Behead Me Mystery Cache

The cache is not at the posted coordinates. It is less than 2 miles from there. Solve the puzzle below to get the coordinates.

To get the coordinates you must correctly answer a riddle. It has a one-word answer of at least five letters.

Riddle: I sometimes stand on one leg. Behead me and I stand on two. Behead me again and I stand on four. Name me.

Enter the solution to the riddle in Certitudes below to get the final coordinates. Take care removing and replacing the cache and in opening and closing the container The cache contains a keychain and USGS pin, a logsheet and pencil as of the time of re-enabling.

You can validate your puzzle solution with certitude.