ScienceTake: Parrots Think They’re So Smart. Now They’re Bartering Tokens for Food Parrots can judge the relative value of food, holding out for tasty walnut slivers. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Trilobites: DNA Clues to an Ancient Canary Islands VoyageHow to watch first NASA spacewalk of 2019 during International Space Station upgradePlanet Nine SHOCK: Astronomer explains effect mystery Planet 9 has on entire solar systemA.I. Can Improve Health Care. It Also Can Be Duped.NASA asteroid tracker: An asteroid will pass closer than the Moon TONIGHT at 12,000MPHRed Planet BREAKTHROUGH? NASA hatches plan to SOLVE Mars rover mystery