Australian scientists recently developed GPS trackers that looked like little backpacks, weighed less than a gram, could charge wirelessly and could be quickly released with a magnet. When the researchers tested the trackers on Australian Magpies, though, the birds managed to pinpoint a tiny weak spot in the backpack and helped each other peck the trackers off: birdnote.org/listen/shows/magpies-help-each-other-remove-tracking-devices Australian Magpie © Lance / FCC | BirdNote