Question

I never see such an old ostrich for wanting to gobble everything...

Answer 1

C.) metaphor

A metaphor is figurative language because it is a figure of speech in which a comparison is being made between two things that are generally quite different in order to provide a more impactful/effective description.  A metaphor states one thing is another thing as is the case with the sentence you provided in which a person is being called an ostrich in order to provide the best description for readers.