Answer:
What screams when put in a pot of boiling water?
The homes of tiny creatures that collect in corners if you aren't vigilant about dusting.
A mysterious, fantastic creature, It has one defining feature, And for humans at their worst, In their eyes it's just a horse
Oh how I love my dancing feet! They stay together - oh so neat. And when I want to walk a line, They all stay together and do double time. I count them up, ten times or more, And race on-off, across the floor.
I have eight to spare and am covered with hair.
What is yours but only used by others?