Australian magpies are comrades

In a remarkable act of cooperation, the magpie wearing the tracker remained still while the other magpie worked at the harness with its beak. Within 20 minutes, the helping magpie had found the only weak point — a single clasp, barely a millimeter long — and snipped it with its beak. Dr. Potvin and her team later saw different magpies removing harnesses from two other birds outfitted with them.

The scientists took six months to reach this point. Within three days, the magpies had removed all five devices.