Answer:
They don't forget.
I am the only animal to have the same Latin and common name.
I have no teeth but I can swallow my food whole. I slither on the ground. What am I?
What insect does a blacksmith manufacture?
What has a coat? Hugs you not in sympathy? Whose smile you'd rather not see? Whose stance is a terrible thing to see? Who is it that brave men run away from? Whose fingers are clawed? Whose sleep lasts for months? And who's company we shunt?
You use it between your head and your toes, the more it works the thinner it grows.