https://ift.tt/2wwdHAe Do Parrots Know Economics? Kind Of. A test of four different species shows they can accurately assign value to food and tokens, swapping lower value items for higher value food. JAMES GORMAN and CHRISTOPHER WHITWORTH https://ift.tt/2oY5bTZ September 11, 2018 at 05:30AM

By JAMES GORMAN and CHRISTOPHER WHITWORTH from NYT Science https://ift.tt/2CUbp1h