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
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