While walking in Central Park, I came upon this male Northern cardinal (above) attempting to open a peanut. I probably enjoyed seeing this "event" more than the cardinal ultimately enjoyed eating the legume. A nearby female cardinal poking at a peanut (as seen below) was also captured my attention.
According to many sources including, BIRDWATCHING HQ, cardinals are "classified as a granivorous animals because they live on a diet consisting of mostly seeds. Their short, stout, cone-shaped beaks are specially designed to crack open the hulls on seeds and shells on nuts."
In volume one of my book series, Words In Our Beak, (pictured below) Cam, the narrator of the series out that cracking shells is good for their beaks.