SeEtta at al, Those are the seeds (samaras) of Siberian Elm the Evening Grosbeaks are feeding on in your photos. Lots of birds like them including American and Lesser Goldfinches, grosbeaks, Cassin's and House Finches, etc. I suspect we will see Evening Grosbeaks in good numbers over the next decade, as the forest insect they are most dependant on, the Western Spruce Budworm, goes thru an "up" cycle in Douglas-fir, true firs, and maybe spruce (they have been at relatively low ebb statewide since the mid-1980's but are currently known to be at high levels in the the Rampart Range near Colorado Springs, the Wet Mountains, and the east slope of the Sangre de Cristo Mountains (as well as several areas in the southwest CO mountains such as the Culebra and San Juan ranges)).
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