Date: 7/14/25 2:04 pm
From: Mark Holmgren via groups.io <maholmgren33...>
Subject: [sbcobirding] Post-nesting Breeding behavior by Peregrine Falcons
John Lewis’ almost daily observations of a Peregrine family’s residence for
at least 8 days in Sycamore Canyon highlights a fascinating aspect of
Peregrine breeding biology that deserves greater attention. It appears
that parental care of offspring and their training does not end at the nest
site. We know this is the case with many species, but it’s interesting to
know that one aspect of the complex roles coastal habitats play in late
summer is to provide this ‘Continuing Ed’ program for Peregrines.



Beginning on July 7, John’s bike rides took him past Conejo Road where it
meets Sycamore Cyn. After recognizing that more than one PEFA was hanging
around, he photographed the birds and recognized their age
differences. Because
Peregrines are solitary when not at a breeding site, and because this is
not a breeding site, he was observing a family group still involved in
nurturing offspring. John will show me this area this afternoon—if this
family is still around, it will be at least Day 9 of their occupancy here!



This has happened elsewhere along the South Coast. We can search
eBird for this
kind of observation using BirdView
<https://s3.us-west-1.amazonaws.com/membot.com/BirdView.html?v=4&county=Santa%20Barbara%2C%20Central%20Coast%2C%20California%2C%20United%20States%20(US)%2C%20North%20America&source=eBird%20checklists&species=%3E2%20Peregrine%20Falcon%20only&photosOnly=0&otherTaxa=0&loc=&hotspotsOnly=0&region=Santa%20Barbara%20coastal%20plain%20and%20terraces&date=Jun-15-Sep-31&birder=&comments=%2B&groupMode=checklists&listby=location&<lat...>&<lon...>&<zoom...>.
(Note
the “+” in comments so that we can see only those checklists that include
comments by the observer.) Eliminate the *Santa Barbara coastal plain* option
in *Ecoregion* and one can see that it these post-nesting family groups may
occur frequently also along the North Coast. The challenge to diagnosing
these post-nesting breeding events is aging the individuals involved. By
plumage, birds with horizontal barred flanks and legs, in addition to the
lengthwise ventral streaking, are adults. Birds with ventral streaking
throughout are juveniles. By behavior, the birds shrieking, begging, or
picking up food in air that other birds drop are more likely dependent
fledglings (juveniles).



When observed and documented, these are breeding events no less important
to the survival of offspring than is nesting. Contribute them here
<https://survey123.arcgis.com/share/f6fdd9f0a1d94146a9640e1dd53cf503>.



Good birding,



Mark Holmgren

San Marcos Pass


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