Believe it or not, the United States was once home to scores of wild parrots. No, really! Thick-billed parrots now live in the high-elevation pine tree forests in northern Mexico, but these brightly-colored birds once roamed the skies of New Mexico and Arizona. Thick-billed parrots can break through nearly any nut on the planet, but mostly feed on pine tree nuts, tree bark and insects. Sadly, due to a combination of the illegal pet trade, habitat loss and climate change, these birds have not been seen in the United States for at least 25 years.