Wildbird
"Are you having difficulty unraveling the mysteries of identifying birds of prey? If you are baffled by seemingly similar silhouettes of birds of prey, not to mention plumage variations, then A Photographic Guide to North American Raptors by Brian Wheeler and William S. Clark is the perfect field guide for you. With this guide in hand, you will be ahead of other birders at hawk-watching hotspots."
Canadian Field Naturalist
"I recommend that you buy two copies, one for home and one for your vehicle."