A week ago, while with my dog on his morning walk, I noticed two Red Crossbills perched atop a spruce tree in our front
yard. They were calling and they sounded different from one another, so I pulled out my phone and used Merlin to record
them.I studied the sonograms today and think they were Type 2 Ponderosa ("pope-pope-pope") and Type 4 Douglas
Fir ("whit-whit-whit").This was the first time that I'd heard crossbills of different types calling together
and it helped me appreciate how different their calls are. This flock of mostly Type 2 RECRs has been in and around the
conifers within a block of the south side of the Boulder Community Gardens since August 28. They were still there this
morning.You can hear the recording and see the sonograms at https://ebird.org/checklist/S150498144/media.By the way, I
recently read the fantastic book, "An Immense World" by Ed Yong. In it, I learned that birds hear
"faster" than humans. While we may need a sonongram to see the details of a few milliseconds of bird calls,
the birds apparently can hear the nuances quite easily.Richard TrinknerBoulder
--
--
You received this message because you are subscribed to the Google
Groups "Colorado Birds" group.
To post to this group, send email to cobirds@googlegroups.com
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 cobirds+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/cobirds/abce2d05-c704-425b-a968-42c95d4a5773%40me.com.
