Gunnison Sage-Grouse Centrocercus minimus
We had to view flocks of these nearly-endangered birds from a great distance.
Though they cannot be identified in these photos, their presence can be detected
by their movements. In the first view the upper-left dark spot is a Red-winged
Blackbird. The other dark spots that change positions are the Sage-Grouse. In
the seco 29 April 2015 Doyleville, Colorado
These are recovered tail feathers: