Many of us are aware of the 11+ types of Red Crossbill vocalizations in North America; I recently learned that Evening Grosbeaks have at least five types of vocalizations, which differ by geographic area (we have type 4 here in the Rocky Mts.). Like Crossbills, these differing vocalizations, along with geographic isolation and other factors, could inform speciation among these populations.
In his recent webinar for LA Birders, Lance Brenner provided a comprehensive overview of vocalizations by both Crossbills and Grosbeaks in North America. Here is a link to that webinar: https://www.labirders.org/webinars/crossbills.html Audio recordings of Crossbills & Grosbeaks uploaded to eBird over the past decade have provided tremendous opportunities for researchers to understand geographic differentiation of populations by voice. With the irruption of grosbeaks this winter, I encourage you to record audio of grosbeak calls and upload them to eBird to add to this database, Good birding! Robert Beauchamp Fort Collins -- -- 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/ef023204-e62b-463f-b036-ed7919fdc006n%40googlegroups.com.
