Date: 5/8/18 8:53 am
From: <fkaluza...>
Subject: Re: [birders] Orioles are all wrong!
I liked last years a lot better because I spent time learning to reproduce them very closely.  The ones this year are boring by comparison.  Maybe these punks all have lip rings or tongue studs or something. :)


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On Tuesday, May 8, 2018, 11:49, Janet Hinshaw <jhinshaw...> wrote:

Chances are your birds are different than the ones you had last year. The males have individual songs and can be quite different. Some are only a few notes and some are much longer. Females also sing, although not as complex songs as the males.Here is some information from Cornell's Birds of North America:

Males on adjacent territories often have matching song repertoires, or at least several identical songs or notes (Beletsky 1982a). Edinger (Edinger 1985) suggested that such neighbors might be siblings or unrelated birds from nearby nests who learned from the same adult(s).

Although both these alternatives suggest early song-learning, some males (not all neighbors sing similar songs) may be able to learn songs later and adjust their singing to that of neighbors after territories have been set up (Edinger 1985). Some changes in song occur in adult birds; Clawson (Clawson 1980) noted that although the songs of yearling (in first potential breeding season) and older males were similar with respect to 6 variables considered separately, it was possible to differentiate songs of the 2 age groups using discriminant function analysis of all 6 variables together. 

Janet Hinshaw                                               ph: 734-764-0457Bird Division Collection Manager                   fax: 734-998-0038University of Michigan Museum of ZoologyResearch Museums Center3600 Varsity DriveAnn Arbor, MI 48108-2228 USA  http://lsa.umich.edu/ummz/birds/
On Tue, May 8, 2018 at 10:34 AM, <fkaluza...> <fkaluza...> wrote:

What kind of bad habits do those birds learn wherever they overwinter?  Their musical call (around here) is completely different than it was last year and...as I recall, last year's was a little different than the year before.  Do your orioles sound the same as you remember?  Could strong winds have brought birds from different regions into areas they've not been dominant in before?

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