question: What uses howling to warn others?
choices.text: alligators each species fish catfish animals gila monsters humans wild canines
choices.label: A B C D E F G H
fact2: Wolves are distinguished from other wild canines by their size.
combinedfact: wild canines use howling to warn others
formatted_question: What uses howling to warn others? (A) alligators (B) each species (C) fish (D) catfish (E) animals (F) gila monsters (G) humans (H) wild canines