What is the small egg stealing dinosaur?

Excuse me, could you please clarify what you mean by "the small egg stealing dinosaur"? I'm not familiar with this specific term or creature in the context of biology or paleontology. Are you referring to a fictional dinosaur from a movie, book, or game? Or perhaps it's a colloquial term for a small dinosaur species that is known to have stolen eggs in the fossil record? Could you provide more context or details to help me better understand what you're asking about?