Re: [cayugabirds-l] Why cowbirds foster their eggs to other birds
Marilyn only caught the tail end of the radio spot, and didn't get the names of any experts. But here's an article that discusses the origins of brood parasitism: http://beheco.oxfordjournals.org/content/17/2/196.full.pdf For each of a number of avian lineages in which obligate interspecies brood parasitism has independently evolved, the authors examined the probability that it evolved directly from the normal breeding mode (through such routes as the takeover or use of nests built by other species, or communal laying by cooperative species), versus indirectly by way of transitional intraspecies nest parasitism. -- Cayugabirds-L List Info: http://www.NortheastBirding.com/CayugabirdsWELCOME http://www.NortheastBirding.com/CayugabirdsRULES http://www.NortheastBirding.com/CayugabirdsSubscribeConfigurationLeave.htm ARCHIVES: 1) http://www.mail-archive.com/cayugabirds-l@cornell.edu/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/Cayugabirds 3) http://birdingonthe.net/mailinglists/CAYU.html Please submit your observations to eBird: http://ebird.org/content/ebird/ --
Re: [cayugabirds-l] Why cowbirds foster their eggs to other birds
Hi Marilyn, This article from the Smithsonian National Zoo covers your question: http://nationalzoo.si.edu/scbi/migratorybirds/fact_sheets/default.cfm? fxsht=3 -Geo On Jun 26, 2011, at 9:06 AM, Marilyn Ray wrote: Hello Birders, The other day I got into my car just as a show about birds was ending on the car radio. I did not get to hear the name of the expert who was telling the audience about why cowbirds started leaving their eggs in the nests of other birds to hatch and raise their young. The expert said that the practice had its origins in the middle part of the country when cowbirds had traditionally followed the roaming buffalo herds and did not have time to lay and hatch their own eggs before the herd moved on and they had to follow. Could someone please tell me if this story is true? If so, what was the food the birds got from following the buffalo that they could not get elsewhere? Thanks, Marilyn Ray -- Cayugabirds-L List Info: http://www.NortheastBirding.com/CayugabirdsWELCOME http://www.NortheastBirding.com/CayugabirdsRULES http://www.NortheastBirding.com/CayugabirdsSubscribeConfigurationLeave.htm ARCHIVES: 1) http://www.mail-archive.com/cayugabirds-l@cornell.edu/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/Cayugabirds 3) http://birdingonthe.net/mailinglists/CAYU.html Please submit your observations to eBird: http://ebird.org/content/ebird/ --
RE: [cayugabirds-l] Why cowbirds foster their eggs to other birds
Hi Marilyn, Well, I don't see anything in this article that suggests any reason that cowbirds STARTED laying their eggs in other birds nests. We are talking about something that happened way back during the cowbird's evolutionary history here, tens or hundreds of thousands of years ago. So in fact we will never know exactly why the first cowbird female started the trend to parasitism. What your expert put forward was a theory of why the behavior might have been adaptive for the cowbird population, ie what advantages did the behavior offer the population. It certainly is a plausible explanation, in my opinion. Who was the biologist in the radio piece by the way? Interesting topic Marie (currently in June Lake, California hence my recent absence from Cayugabirds-L...but...I'll be back!!!) Marie Read Wildlife Photography 452 Ringwood Road Freeville NY 13068 USA Phone 607-539-6608 e-mail m...@cornell.edu http://www.marieread.com ***NEW*** See my beautiful photo notecards: http://www.marieread.com/cpg/displayimage.php?album=478pos=0 From: bounce-37740256-5851...@list.cornell.edu [bounce-37740256-5851...@list.cornell.edu] On Behalf Of Geo Kloppel [geoklop...@gmail.com] Sent: Sunday, June 26, 2011 10:01 AM To: CAYUGABIRDS-L Subject: Re: [cayugabirds-l] Why cowbirds foster their eggs to other birds Hi Marilyn, This article from the Smithsonian National Zoo covers your question: http://nationalzoo.si.edu/scbi/migratorybirds/fact_sheets/default.cfm? fxsht=3 -Geo On Jun 26, 2011, at 9:06 AM, Marilyn Ray wrote: Hello Birders, The other day I got into my car just as a show about birds was ending on the car radio. I did not get to hear the name of the expert who was telling the audience about why cowbirds started leaving their eggs in the nests of other birds to hatch and raise their young. The expert said that the practice had its origins in the middle part of the country when cowbirds had traditionally followed the roaming buffalo herds and did not have time to lay and hatch their own eggs before the herd moved on and they had to follow. Could someone please tell me if this story is true? If so, what was the food the birds got from following the buffalo that they could not get elsewhere? Thanks, Marilyn Ray -- Cayugabirds-L List Info: http://www.NortheastBirding.com/CayugabirdsWELCOME http://www.NortheastBirding.com/CayugabirdsRULES http://www.NortheastBirding.com/CayugabirdsSubscribeConfigurationLeave.htm ARCHIVES: 1) http://www.mail-archive.com/cayugabirds-l@cornell.edu/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/Cayugabirds 3) http://birdingonthe.net/mailinglists/CAYU.html Please submit your observations to eBird: http://ebird.org/content/ebird/ --
RE: [cayugabirds-l] Why cowbirds foster their eggs to other birds
Before we start expert-bashing, let's hear some facts. Who exactly said what? There are a number of theories that have been put forth for the origin of brood parasitism in cowbirds (more than one species, by the way). I doubt if any real expert is convinced any one is the correct one or wouldn't entertain alternate ideas. ;^) Kevin -Original Message- From: bounce-37740454-3493...@list.cornell.edu [mailto:bounce-37740454-3493...@list.cornell.edu] On Behalf Of Marie P Read Sent: Sunday, June 26, 2011 3:20 PM To: CAYUGABIRDS-L Subject: RE: [cayugabirds-l] Why cowbirds foster their eggs to other birds Hi Marilyn, Well, I don't see anything in this article that suggests any reason that cowbirds STARTED laying their eggs in other birds nests. We are talking about something that happened way back during the cowbird's evolutionary history here, tens or hundreds of thousands of years ago. So in fact we will never know exactly why the first cowbird female started the trend to parasitism. What your expert put forward was a theory of why the behavior might have been adaptive for the cowbird population, ie what advantages did the behavior offer the population. It certainly is a plausible explanation, in my opinion. Who was the biologist in the radio piece by the way? Interesting topic Marie (currently in June Lake, California hence my recent absence from Cayugabirds-L...but...I'll be back!!!) Marie Read Wildlife Photography 452 Ringwood Road Freeville NY 13068 USA Phone 607-539-6608 e-mail m...@cornell.edu http://www.marieread.com ***NEW*** See my beautiful photo notecards: http://www.marieread.com/cpg/displayimage.php?album=478pos=0 From: bounce-37740256-5851...@list.cornell.edu [bounce-37740256-5851...@list.cornell.edu] On Behalf Of Geo Kloppel [geoklop...@gmail.com] Sent: Sunday, June 26, 2011 10:01 AM To: CAYUGABIRDS-L Subject: Re: [cayugabirds-l] Why cowbirds foster their eggs to other birds Hi Marilyn, This article from the Smithsonian National Zoo covers your question: http://nationalzoo.si.edu/scbi/migratorybirds/fact_sheets/default.cfm? fxsht=3 -Geo On Jun 26, 2011, at 9:06 AM, Marilyn Ray wrote: Hello Birders, The other day I got into my car just as a show about birds was ending on the car radio. I did not get to hear the name of the expert who was telling the audience about why cowbirds started leaving their eggs in the nests of other birds to hatch and raise their young. The expert said that the practice had its origins in the middle part of the country when cowbirds had traditionally followed the roaming buffalo herds and did not have time to lay and hatch their own eggs before the herd moved on and they had to follow. Could someone please tell me if this story is true? If so, what was the food the birds got from following the buffalo that they could not get elsewhere? Thanks, Marilyn Ray -- Cayugabirds-L List Info: http://www.NortheastBirding.com/CayugabirdsWELCOME http://www.NortheastBirding.com/CayugabirdsRULES http://www.NortheastBirding.com/CayugabirdsSubscribeConfigurationLeave.htm ARCHIVES: 1) http://www.mail-archive.com/cayugabirds-l@cornell.edu/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/Cayugabirds 3) http://birdingonthe.net/mailinglists/CAYU.html Please submit your observations to eBird: http://ebird.org/content/ebird/ -- -- Cayugabirds-L List Info: http://www.NortheastBirding.com/CayugabirdsWELCOME http://www.NortheastBirding.com/CayugabirdsRULES http://www.NortheastBirding.com/CayugabirdsSubscribeConfigurationLeave.htm ARCHIVES: 1) http://www.mail-archive.com/cayugabirds-l@cornell.edu/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/Cayugabirds 3) http://birdingonthe.net/mailinglists/CAYU.html Please submit your observations to eBird: http://ebird.org/content/ebird/ --
