I'd add to this that I saw 10 Turkey Vultures over Marjorie Perry Nature Preserve. They appeared to be drifting east over (give or take) E. Belleview Ave. While this is in Greenwood Village, it's near enough to west Centennial to be pertinent to Kevin's observations.
Also at the preserve was my first Wood Duck of the year, several Red-tailed Hawks, and a potential Say's Phoebe pair. (Are they paired up at this point? I've seen two seemingly feeding "together" a couple of times at the preserve this week.)
- Jared Del Rosso
Centennial, CO