The night flight recording equipment was busy last night, with 120 warbler
and sparrow flight calls including 24 from American redstart. This has been
the best night since May 3-4 and the calls were increasing toward the end
of the night. ... So if you are in the area let us know if you see a change
in the birds today.

For detailed information about what bird calls were recorded last night
click on the link below.
http://www.oldbird.org/Data/2012/ONWR/ONWR.htm
Also if you are interested in this area of study there are recorders 5
other locations in the U.S., click on the Last Night link at the top of the
page.

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