I took a short walk along the High Line Canal Trail in Greenwood Village / Centennial (Arapahoe County) this morning. No uncommon species to report, but it was a notable morning for two encounters: a female Northern Flicker hanging out in a cavity in a cottonwood and an active flock of Bushtits. The latter gave emphatic calls when a Sharp-shinned Hawk entered the scene and then again when the hawk departed.
I didn't react quickly enough to get a recording and couldn't conjure the call now from memory to describe it. But presumably this was what *Birds of the World* calls the *Avian Predator Warning Call: "**Sre-e-e-e e-e-e," *a "high-pitched warbling call." A 1903 article by Joseph Grinnell is *Birds of the World*'s' source for the description of this call. You can read that article here: https://sora.unm.edu/node/94393. A couple of photos and other observations at my blog <https://lonesomewhippoorwill.com/2023/02/17/birding-the-high-line-canal-trail/> . - Jared Del Rosso Centennial, CO -- -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To post to this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/cobirds?hl=en?hl=en * All posts should be signed with the poster's full name and city. Include bird species and location in the subject line when appropriate * Join Colorado Field Ornithologists https://cobirds.org/CFO/Membership/ --- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/efbbec74-88f0-461a-9a4d-d69827b0fa64n%40googlegroups.com.
