Crow References

3D View:

http://www.turbosquid.com/3d-models/obj-corvus-cryptoleucus-chihuahuan-raven/934530


http://www.turbosquid.com/3d-models/3ds-max-crow-rigged/563951


http://www.turbosquid.com/3d-models/realistic-raven-3d-model/749400



Drawing Step-by-Step:

http://www.dragoart.com/tuts/7416/1/1/how-to-draw-a-crow.htm