[cayugabirds-l] Why cowbirds foster their eggs to other birds

2011-06-26 Thread Marilyn Ray
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

Re: [cayugabirds-l] Why cowbirds foster their eggs to other birds

2011-06-26 Thread Geo Kloppel
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

RE: [cayugabirds-l] Why cowbirds foster their eggs to other birds

2011-06-26 Thread Marie P Read
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

RE: [cayugabirds-l] Why cowbirds foster their eggs to other birds

2011-06-26 Thread Kevin J. McGowan
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