It just so happens that I am reading Hawks from Every Angel by Jerry
Liguori.
This information may be helpful, or it might be something you already
know.
Adult light Harlan's are brilliant white underneath, lacking buff or
rufous tones. They have broad, distinct streaks on the belly, lightly
marked underwings, a dark brown head with a white throat, and a white
line above and below the eye. Rarely, Harlan's show a finely barred
bellyband. The upperside of Harlan's is dark brown. Adult light morph
Harlan's have white mottling that is often limited to the scapulars,
whereas juveniles typically show extensive white mottling on the upper
wing coverts, and whitish primary wing panels. Adult Harlan's typically
have grayish white tails with a broad dark or rufous tip. Juvenile
Harlan's are often bright whitish underneath with a white throat and
white streaking on the head. Juvenile Harlan's have a banded tail similar
to that of other races, but the tail of Harlan's can show wavy bands and
rufous or gray mottling throughout. Some adult Harlan's show wavy banding
on the remiges, or lack banding altogether. Red-tailed Hawks of other
races have even banding to the remiges, but this trait is often difficult
to judge in the field. Be aware that some Red-tailed Hawks of other races
can look bright whitish at times like Harlan's, especially in spring.

Linda Phillips
sweetmem at juno.com
Kenmore, 98028-2616
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