The video below is shows a BBC clip of a sparrow hawk hunting. Sparrow hawks are accipiters, and fill the niche in England that in BC is filled by sharp shinned and coopers hawks. These are bird hunting birds who rely on speed camouflage to catch their prey. Hunting song birds is difficult, as is show in this clip, they communicate clearly with each other and call out when alarmed- learning to hear and understand the purpose behind bird behavior and calls is often referred to as ‘bird language’.
This short clip, though grainy in visual quality is a fantastic sequence showing both the intensity of an accipiters hunting flight and the communication of the song birds in question.