Answer:
It is an insect, and the first part of its name is the name of another insect. What is it?
The ones in the sea are prickly, but the ones on the street might pickpocket you.
I have no teeth but I can swallow my food whole. I slither on the ground. What am I?
They don't forget.
What build its house with earthen string and ensnares its prey with a biting sting?
You use it between your head and your toes, the more it works the thinner it grows.