Neat photos, Jennifer. Those are the flight feathers of a Yellow-shafted Flicker. Here is a useful site for feather ID showing the wing feathers of a flicker (the secondaries and primaries, together called the remiges):
http://www.fws.gov/lab/featheratlas/feather.php?Bird=YSFL_wing_adult
Some of the primaries in the prey you found are red not yellow, which is caused by diet in some Yellow-shafted Flickers. This was recently discussed by Jocelyn Hudon and his lab at the Royal Alberta Museum. Here is a photo by Tom Johnson showing this pattern.
https://www.flickr.com/photos/bonxie88/9925116723/
Where the two subspecies groups of Yellow-shafted and Red-shafted flickers hybridize, several characters crop up in hybrids, among those hybrid characters are orange tinted remiges.
I think both Accipiters are Cooper's. The bird in flight shows a prominent white tip to a graduated tail (outer tail feathers shorter than inners). That and the pattern on the head and shape make it a Cooper's. Flicker must be a favorite meal of Accipiters.
Here is the source of the diet paper at AOU meeting, Chicago, 2013:
Diet, not introgression, explains red flight feathers in Yellow-shafted Flickers in eastern North America. Jocelyn Hudon, Royal Alberta Museum, Edmonton, AB, Daniel P. Shustack, Robert Driver, and Nate Rice, Academy of Natural Sciences and Drexel Univ., Philadelphia, PA.
Louis Bevier
Fairfield
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