Date: 9/30/26 5:18 pm From: richard s. cimino via groups.io <rscimino...> Subject: [northbaybirds] Evening Grosbeaks & Clark's Nutcrackers
What about the Clarks Nutcracker eruption?
For several years, the CLNU were rare during the summer birding season.
This past July during a four day back packing trip we had Clark’s Nutcrackers in small groups along our route: all be very vocal.
Could these CLNU be Rocky Mountain Nutcrackers on the move?
A birder in Southern California two weeks ago post 1500 CLNU’s, that a lot of birds.
Rich Cimino
Yellowbilledtours.com
From: <peninsula-birding...> <peninsula-birding...> On Behalf Of Alvaro Jaramillo via groups.io
Sent: Wednesday, September 30, 2026 5:19 AM
To: <kforward...>; 'Peninsula Birding' <peninsula-birding...>
Subject: Re: [pen-bird] Evening Grosbeaks at Purisima Creek Redwoods OSP 9/29
Kent
Looking at the spectrograms, it looks like this is a type 1 Evening Grosbeak. You could change the ID to that specifically. This is a population from the Pacific Northwest and BC/Alberta. Not the type you have in the Cascades/Sierra. This is interesting as it suggests that the “montane invasion” birds may be coming from various different places, so what is affecting Evening Grosbeaks may not be the same thing as what is influencing Pinyon Jays.
From: <peninsula-birding...> <mailto:<peninsula-birding...> <peninsula-birding...> <mailto:<peninsula-birding...> > On Behalf Of Kent Forward via groups.io
Sent: Tuesday, September 29, 2026 11:22 PM
To: Peninsula Birding <peninsula-birding...> <mailto:<peninsula-birding...> >
Subject: [pen-bird] Evening Grosbeaks at Purisima Creek Redwoods OSP 9/29
Today while birding the riparian area of lower Purisima I heard Evening Grosbeaks! I wasn't able to obtain a visual. I have been studying the vocalizations of some of the rarer birds partaking in the current large irruption of montane birds to our area so when I heard these vocalizations it reminded me of Evening Grosbeak, so I got Merlin going and it concurred, and also I got feedback from several skilled ear-birders in the affirmative for Evening Grosbeak! This was in the lower parking lot at 37.437585, -122.370610
