Parrots and Parakeets

This is one from the Amazonian portion of Ecuador a couple of years ago that I wanted to share.  I was purposely trying to get the wing blur of the Orange-cheeked Parrots as I had seen they produce a rainbow when photographed in flight at a slow shutter speed (also it is so dark in this area getting a sharp flight shot with decent quality would be impossible) while at the same time showing some sharp birds on the ground.  To accomplish this the lens needs to be fixed in one spot and not panning. 

Canon 7D 500F4 1/40 F5.6, iso 800, Av mode, evaluative metering -1.3, Gitzo tripod, Wimberley head.