The Ferruginous Hawk is reported as being the largest in the United States. Full grown adults reach an average length of 23 inches, with a 56 inch wingspan, and tends to weigh around 3.5 lbs. They are found primarily in the American Southwest, however it has been seen as far north as Alberta after migrating in the summer. This large raptor bird feeds on mostly rodents, smaller birds, and snakes.
Another good candidate (since accurate information on which species is TRULY the largest hawk in America is clearly hard to find!) is the familiar red-tailed hawk. The red-tailed hawk is one of a group of hawks known as Buteos, larger in general than the group known as the Accipiters. Accipiters include all goshawks and sparrowhawks, while Buteos include the red-tailed, red-shouldered, Ferruginous, and rough-legged hawks. Since Buteos in general are larger than Accipiters, and female hawks are larger in general than males, the red-tailed, Ferruginous and rough-legged females will probably tend to be the largest hawks.
Virtually all hawk species are native to America.
It Is actually the red-tailed hawk. The first link is complete info on the species including size, diet, habitat, lifespan, and gestation period. The second link is to a web site stating that its the largest species of hawk.
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