Answer:
I am the home for feathery animals.
I have a hundred legs but cannot stand. I have a long neck but no head. I cannot see and I help keep your house neat and tidy.
I regularly change shape yet remain a sphere. I am always there but not often seen. What am I?
I have roots that no one sees and I am taller than trees. Up, up I go, but never do I grow. What am I?
No matter how little or how much you use me, you change me every month.
When is it bad luck to see a black cat?