Binoculars with 8x to lOx magnification are considered best, although 7x binoculars also can be used. ... raptors are difficult to identify to species, especially when they are flying at great speeds and altitudes. ... size and shape), of a bird can help place individuals in groups that will aid in their identification ( e.g., accipiters, buteos, falcons, cathartids, eagles, etc., all of which have recognizable gestalts).
|Title||:||Raptor migration watch-site manual|
|Author||:||Keith L. Bildstein, Jorje I. Zalles, Hawks Aloft Worldwide (Program)|