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  1. Re: [CALBIRDS] Glossy Ibis or Hybrid ID suggestion LINK
    DATE: May 13, 2018 @ 7:24pm, 3 month(s) ago
    Hi Steve, That’s an interesting bird, and quite possibly a female Glossy
    Ibis. I encourage you to submit photos and a description to the CBRC, where we
    might ultimately be as confounded as you. I’m fascinated by ibises, and
    periodically spend an hour or two looking through the myriad photos that are
    available online. I recently spent some time investigating the frequency of
    reddish ‘knees’ in Glossy, and came away with the impression that this trait is
    rather rare. While apparently pure birds can be found, like an April bird with ‘bubblegum’
    knees on Greg Lasley’s Texas website, and this May 2001 Alviso bird   on Joe Morlan’s site ( https://fog.ccsf.edu/~jmorlan/glib.htm ),
    I find it unusual enough to consider hybrid origin when present. Note that an
    interesting hybrid at the Baker sewage ponds in June 2016 ( https://ebird.org/view/checklist/S30076782 )
    had reddish knees, as well as telltale pinkish tones within its central facial
    skin. Speaking of facial skin, one thing I find curious about your bird is the
    bluish gray coloration of its facial skin, with the same light color being
    present on the orbital ring (very unusual). I looked through hundreds of photos
    of breeding season Glossy this afternoon, and nearly all of them had dark slate
    interior facial skin, helping to set off the crisp bluish borders. The absence
    of that feature, in combination with the color of the knees, does make me
    wonder if your bird might be a hybrid. However, here are photos of an equally interesting
    ibis taken on the LA River in May 2016 ( https://www.flickr.com/photos/94434086@N05/27339243396/ )
    that also sports reddish knees and lacks dark slate facial skin, yet was
    considered an acceptable Glossy. It also has a curious eye color (possibly dark
    ruby), and a strong violet cast to the tertials (see Sibley 2001). Bottom line,
    there is still much to learn about hybridization and its variable phenotypic
    expressions in these sister species, and I suggest you share this record with
    the committee. Jim Pike Huntington Beach
    
    On Sun, May 13, 2018 at 4:46 PM, stevestump@... [CALBIRDS] < CALBIRDS-noreply@yahoogroups.com > wrote:
    
      5/13/2018 4:45 PM
    
    This morning I found an Ibis that I would like input on. I entered it into eBird as a Hybrid Glossy x White-faced because of the pink ankles and knees. Is it possible to be a Glossy Ibis See the pics on my checklist. Lassen County, Susanville WWTP. Thanks, Steve Stump
    
    https://ebird.org/view/ checklist/S45632515
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