Difficult hand held shot of a fast dove in full flight taken in good light from about 20 meters ( 60 feet).
You can compare this shot with number 3280 or 2455 in the 500 mm vr gallery which show flying doves. The Nikon 500 takes crisper shots, can work in less light, but the Sigma which costs 7 times less, holds it own in good light and is MUCH easier to handle.