Answer:
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
I have four legs but no tail. Usually I am heard only at night.
I have a hundred legs, but cannot stand. I have a long neck, but no head. I cannot see. I'm neat and tidy as can be.
What can answer in any language? What can speak without a mouth? What can sing without an ear?
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
The more of me you take, the more I appear behind you. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?