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Index of Subjects Hi Steve I'm not an expert on anything but there was, and likely still is, a lot of really interesting work being done on bird song development and recognition. It is generally thought that birds are born with a genetic template of their song that is shared by all members of that species. This template is usually (but not always) modified through learning leading to individual and geographic song variations. But the shared template coded into each individual of that species remains and likely is the reason the birds can filter out other species' songs despite intra- and interspecific variations. They can pick out the basic genetically coded "song" amidst all of the noise. It seems technology would need to be able to tease out the genetically encoded song template of each species to reliably separate them. If or how this could ever be done is beyond me. I am mainly dragging this up from memory of papers read during some song-type recording work about 20yrs ago. This site covers the same subject https://web.stanford.edu/group/stanfordbirds/text/essays/Vocal_Development.html and further searching should turn up some other more (recent) works on this topic. Nancy On 2015-06-16, at 1:10 PM, Stephen Shaw <srshaw@Dal.Ca> wrote: > If experienced birders armed with sound analysis software (that birds don't have) sometimes can't easily distinguish between calls made by related species, are the birds themselves in the same fix? Do species with similar songs occasionally get attracted acoustically to the wrong species partner or rival, when there's no immediate visual contact to help? Are their sound filters just better than ours, or are they helped mostly by occupying different geographic niches? Or is the learned component in bird songs important for this? > If two sympatric daughter species evolved from their common ancestor, there must have been strong selection pressure for the songs to diverge significantly to become operationally distinct in order to maintain breeding isolation. > Is anything known about what constitutes a 'just noticeable difference' in a song for this? -- someone must have looked at this. > Steve > ________________________________________ > From: naturens-owner@chebucto.ns.ca [naturens-owner@chebucto.ns.ca] on behalf of Jeff MacLeod [jeffnaturens@gmail.com] > Sent: Tuesday, June 16, 2015 7:51 AM > To: naturens > Subject: Re: [NatureNS] Looking for help with a song ID > > Thanks for the replies. I feel pretty silly for not realizing that is a yellow-rump! I knew it was familiar, but get stuck looking for a distinct two-part trill from a yellow-rump. Oh well. Rick, glad you also think the first is a Redstart. > > Jeff > > > On Tue, Jun 16, 2015 at 7:38 AM, nancy dowd <nancypdowd@gmail.com<mailto:nancypdowd@gmail.com>> wrote: > Oops. I did not see Rick's comment before I posted. At least we agreed. > > Nancy > On 2015-06-16, at 7:31 AM, nancy dowd <nancypdowd@gmail.com<mailto:nancypdowd@gmail.com>> wrote: > >> Not sure but your second recording XC252875 sounds like a Yellow-rumped Warbler- a bouncy slightly rising and falling trill. >> >> Nancy >> On 2015-06-15, at 10:25 PM, Jeff MacLeod <jeffnaturens@gmail.com<mailto:jeffnaturens@gmail.com>> wrote: >> >>> Another that I'm having some difficulty with: >>> http://www.xeno-canto.org/252875 >>> >>> >>> >>> On Mon, Jun 15, 2015 at 9:04 PM, Jeff MacLeod <jeffnaturens@gmail.com<mailto:jeffnaturens@gmail.com>> wrote: >>> http://www.xeno-canto.org/252866 >>> >>> From Meaghers Grant this morning. I heard some Redstarts around there that sounded like this and left out the end note. >>> >>> Thoughts about the ID? >>> >>> -- >>> Jeff MacLeod >>> Halifax >>> >>> >>> >>> -- >>> Jeff MacLeod >>> Halifax >> > > > > > -- > Jeff MacLeod > Halifax
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