From south-bay-birds-bounces+south-bay-birds-archive=[[email protected]] Sat Mar 27 17:28:21 2004 Received: from www.plaidworks.com (localhost [127.0.0.1]) by plaidworks.com (8.12.9/8.12.9) with ESMTP id i2S1QcAp002794 for <[[email protected]]>; Sat, 27 Mar 2004 17:26:38 -0800 (PST) Received: from flavatown.mail.pas.earthlink.net (flavatown.mail.pas.earthlink.net [207.217.120.148]) by plaidworks.com (8.12.9/8.12.9) with ESMTP id i2S1OupJ002727 for <[[email protected]]>; Sat, 27 Mar 2004 17:24:56 -0800 (PST) Received: from swan.mail.pas.earthlink.net (swan.mail.pas.earthlink.net [207.217.120.123]) by flavatown.mail.pas.earthlink.net (8.11.7+Sun/8.11.6) with ESMTP id i2RNeNE12296 for <[[email protected]]>; Sat, 27 Mar 2004 15:40:23 -0800 (PST) Received: from 1cust53.tnt4.sjc4.da.uu.net ([68.129.221.53] helo=earthlink.net) by swan.mail.pas.earthlink.net with esmtp (Exim 3.33 #1) id 1B7NOp-0003JA-00; Sat, 27 Mar 2004 15:39:36 -0800 Message-ID: <[[email protected]]> Date: Sat, 27 Mar 2004 15:39:52 -0800 From: Rosalie Lefkowitz <[[email protected]]> X-Mailer: Mozilla 4.79 (Macintosh; U; PPC) X-Accept-Language: en MIME-Version: 1.0 To: Bill Bousman <[[email protected]]> Subject: Re: [SBB] Hawk ID help References: <[[email protected]]> <[[email protected]]> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: [[email protected]] X-BeenThere: [[email protected]] X-Mailman-Version: 2.1.5b1 Precedence: list List-Id: South Bay Birding List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: south-bay-birds-bounces+south-bay-birds-archive=[[email protected]] Errors-To: south-bay-birds-bounces+south-bay-birds-archive=[[email protected]] Cooper's Hawks nested in a tree halfway between my house and that of Phyllis Browning in 1992. Both male and female had retained the juvenile plumage, but began to molt before the young fledged. Rosalie Lefkowitz Bill Bousman wrote: > > At 05:21 PM 3/26/04, Michael Pollack wrote: > >Hi all, > > > >I could use some help identifying an immature hawk that frequented my yard > >in Cupertino last year. I took some pictures which can be viewed at > >http://home.comcast.net/~m_pollack/HawkID/index.htm . You can click on each > >thumbnail to see a larger image. > > Maybe when the Mikes come back from their SoCal adventure they can > straighten this out. I find the tail and head proportions of not too much > use on these photos and this leaves me with trying to gauge the relative > eye position. In some photos it looks like an immature Sharp-shinned (more > centered, larger eye in proportion to face) and in others more like a > Cooper's (more forward, smaller eye in proportion to face). In the end I > would leave this as imm. accipiter species. > > I'm not completely familiar with accipiter molt sequences, but I think that > it is something like they fledge in a juvenal plumage, then molt in their > first fall to 1st basic, which we call immature, then molt in their second > fall (second calender year) to their definitive basic, which we call > adult. There is a prealternate molt in there, but I don't know how > extensive it is. As a consequence, we can have breeding birds in immature > plumages. This is not uncommon for females, but much less common for > males. We have one record that I can recall of two immature or 1st-year > birds paired (Phyllis Browning observation?). Some of the local > banders/hawk aficianados will know these plumages exactly. > > The other question is more easily answered (but not relevant to the > id). Cooper's is a common nesting species throughout urban areas and > possibly less common away from urban areas throughout the county (although > the differential numbers may be all caused by observer bias). Sharpies are > rare nesting species in more remote areas of the Diablo Range and the Santa > Cruz Mountains and have not been found nesting on the valley floor in a > hundred years. > > Bill Bousman > Santa Clara County records compiler > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > south-bay-birds mailing list ([[email protected]]) > Help/Unsubscribe/Update your Subscription: > http://www.plaidworks.com/mailman/options/south-bay-birds/rlefko%40earthlink.net > > This email sent to [[email protected]] _______________________________________________ Do not post admin requests to the list. They will be ignored. south-bay-birds mailing list ([[email protected]]) Help/Unsubscribe/Update your Subscription: http://www.plaidworks.com/mailman/options/south-bay-birds/south-bay-birds-archive%40plaidworks.com This email sent to [[email protected]]