Next to the Red-Tailed Hawk, the most common Winter hawk on the prairie is the Rough-Legged Hawk.  As with most hawks, it has different morphs.

Rough-Legged Hawk

Rough-Legged Hawk

The easiest way to identify them in flight is the large, dark patch between the shoulder and wrist.

Rough-Legged Hawk

A reddish dark morph.

Young Dark Phase Rough-Legged Hawk

If it looks like the Maltese Falcon of Humphrey Bogart fame, it is a dark morph Rough-Legged Hawk.

Dark Phase Rough-Legged Hawk

Dark Phase Rough-Legged Hawk

Dark Phase Rough-Legged Hawk

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