NatGeo's "Animal Minds" article
The really interesting piece also revealed that Betty, the New Caledonian Crow whom I cite when trying to convince Mom that crows are not bad noisy creatures, died recently from an infection. That news put a slight damper on my morning.
Don't miss the related photo gallery -- which includes Uek, a New Caledonian Crow; Alex; and a Western Scrub-Jay named Psychobird -- and multiple videos. One video focuses on birds and bats.