Difficult

What is never used unless it's in a tight place?

related riddles

They're up near the sky, on something very tall. Sometimes they die, only then do they fall.

In this place, people lie, people cry, and people ask why. In this place, people sleep, people weep, and people's solitude, they keep. What is it?

Has feathers but can't fly. Rests on legs but can't walk.