Scientists trained three carrion crows to produce one, two, three or four vocalizations based on various visual or auditory cues. pete beard via Flickr under CC BY 2.0 DEED Carrion crows, European ...

Do you know how many feathers a turkey (Meleagris gallopavo) has? I don't either. Apparently no one does. Can you believe that? You'd think we would. Ben Franklin thought it should be our national ...