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Fall Raptor Migration Monitoring Field Location: Hayden Valley, Yellowstone National Park (TRANSLATION)
Jeep Pagel: Can you determine if it is an adult, or if it is in subadult plumage? David Haines: It is an adult. Lesley Henry: Is your Cooper’s Hawk moving past one of the more visible sighting points in the sky? David Haines: No. You are seeing another raptor. The Cooper’s Hawk is moving at tree-line level in a steady and fast flight through the valley. Jeep Pagel: Did you see the Swainson’s Hawk flying at a high rate of speed behind it on the same track through the Valley? Leslie Henry: No. Is it still in your field of view? David Haines: The Cooper’s Hawk is out of my view; please document it on our data sheet. I need to look at that other buteo, which I believe may be a Ferruginous Hawk. Also, there was a male American kestrel that was soaring near the Swainson’s Hawk. Leslie -- can you pick it up in your field of view? Leslie Henry: Yes, I see the male American Kestrel; the Swainson’s Hawk you saw is a dark morph, and I have seen another Swainson’s Hawk; a light morph, near Mt. Washburn, and it was moving to the west to the roadcut. |
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David Haines: I can see a raptor which appears to be a Cooper’s Hawk. I have used the silhouette, behavior and plumage to discern the species and age; it is north east of the observation point, traveling to the south east. 
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