Worm

"So... which end of the worm do you think it digs into the ground with: the pointy end or the round end?"
"The pointy end because it can dig it in."

Turns out it was the round end. Well, biology is often not logical on the surface. I'm sure though that there will be an underlying reason if we look it up. My bet is that it will have a mouth peice in the rounded end.