A few years ago I might have agreed that these must be early fall
migrants. However, on 7/10/10 we captured and banded an adult female
Nashville warbler at Eastman Nature Center, Osseo, Hennepin County. She
had a large and vascularized incubation patch, and very likely was
incubating eggs that morning--a new county breeding record. Two years
ago (7/20/08) we banded another adult female Nashville with a large
brood patch at Springbrook Nature Center, Fridley, Anoka County.
Apparently a small number of Nashville warblers do nest in the Metro
area, south of their generally recognized breeding range.
Over the years I've banded 6 other July Nashvilles at Springbrook NC and
they may have been migrants. They were a mix of young, independent
birds and adults who lacked fresh incubation patches or cloacal
protuberances, so they provided no solid evidence of local nesting.
Ron Refsnider
Anoka County
On 7/12/2010 1:19 PM, Clay Christensen wrote:
Spotted a First-of-Fall Nashville warbler here in Lauderdale, W edge of Ramsy
Co., this morning. So, summer is over, then?
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