Follow-up manuscript:
Evans, W. R., M. Grosselet, and G. Ruiz Michael. An unidentified nocturnal
flight call from southern Mexico. Huitzal 18(1):131-140.
http://huitzil.net/blog/?p=1826
From: Bill Evans
Sent: Friday, September 23, 2016 11:40 AM
To: NFC- L
Subject: [nfc-l] Big Double-up
Dear NFCers,
My colleague Manuel Grosselet and I recorded an unidentified night flight call
in southern Mexico (near Minatitlan) in fall 2012. We call it “the big
double-up” for obvious reasons as one can see in the attached spectrograms. We
recorded 32 of the calls near Minatitlan from Oct 16-
