Lots of commotion alerted me to severe harassing of juvenile gang gangs by noisy miners. The gang gangs tried to escape by weaving low, in and out of the trees, then flying above the canopy, but the miners followed and attacked. As the gang gangs fled off to safety, one of the them had a noticable gap in his flight feathers (third photo) - I assume the noisy miners had taken a souvenir.