I have three other books on identifying hawks to help my work counting hawks in migration on hawk hill above the golden gate bridge with the Golden Gate Raptor Observatory. This is the best. The words stick in your brain, the pictures are magnificent to look at and lead you to gain the knowledge to tell the difference between the species. Accipters are the hardest to identify not as accipiters but whether they are Cooper's or Sharp shinned because the two look so much alike. If this is your problem too then this is the book for you.